When I put together my lightweight FX Impact M4 speed build back in October of 2024, the original quick detach RYU was the moderator on the front of it, because it gave that rifle real suppression without adding the length and weight that would have undone the whole point of a fast, handy gun. That build was an FX Impact, but the RYU has never been an FX-only moderator, and the whole idea behind the new version is a QD system that any PCP shooter can adopt no matter what brand of airgun they run. I have written about that original spring-set RYU QD before, so this time I want to focus on what is actually new, which is the RYU QD 2.0, listed in our store as the DonnyFL RYU v2 with the V2 QD Base.
The short version is that the RYU now uses the same V2 quick disconnect mechanism that PJ, our head technician here at DonnyFL, introduced on the Yokozuna this past May. The spring is gone, and in its place is an internal threaded adjuster that lets you decide exactly how tight the moderator locks up on your barrel or shroud, which matters a lot more than most people think once you start asking a small moderator to live on a high pressure PCP.
The DonnyFL RYU QD 2.0, our 1.22 x 5.25 inch modular moderator, now on the tailored fit V2 QD base that gets set up for your rifle.
Quick Summary
- The DonnyFL RYU QD 2.0 (RYU v2) is 1.22 inches (30.48mm) in diameter and 5.25 inches long, offered in .22, .25 and .30 with 1/2 x 20 threads.
- It uses the same tailored fit V2 QD mechanism as the Yokozuna V2 QD, replacing the spring with an internal threaded adjuster so you set the lock-up tension yourself.
- The lock-up is still indexed, so the moderator returns to the same position every time and your point of impact stays put after detaching and reattaching.
- Bore alignment, a repeatable index and modular baffle sections each get their own section below, because they are the reasons this QD system matters for precision.
- Sizing follows our standard rule: same caliber as your gun on a threaded barrel, one size up on a shroud or adapter, and the right DonnyFL thread adapter gets the QD system onto almost any PCP, whatever the make.
- PJ walks through the full V2 base install and tensioning process in his V2 QD install and adjustment video, which is the same video linked on the RYU v2 product page.
What Changed from the Original RYU QD to the RYU QD 2.0
The body of the RYU is the same moderator a lot of you already know. It is 1.22 inches in diameter, which is 30.48mm, it is 5.25 inches long, the individual sections are 6061 T6 aluminum, and the main QD housing and adapter are 7075 aluminum. It is still caliber specific, it is still modular so you can tune the length to your dampening needs, and it still uses our indexed locking system so the moderator seats in the same position every time you put it back on.
What changed is the base. The original RYU, which we still sell as the RYU with the Original, Spring Set QD, used a spring inside the base to hold tension against the barrel adapter. PJ explains in his video that the spring had a real advantage, because it kept tension on the moderator while still letting you pop it on and off easily, but because it was a spring it needed a little bit of room to move. On the V2 base that spring has been replaced with an internal threaded adjuster, and that change takes the potential movement out of the system, which is what allows the moderator to stay stable on higher pressure airguns. I think of it as a tailored fit system rather than a one-size-fits-all spring, because the base gets set up to the specific rifle and adapter it is going to live on.
The RYU QD 2.0 with the barrel adapter off. The adapter threads onto your rifle and the V2 base locks onto it.
Why Lock-Up Tension Matters for Precision
Any quick detach moderator is a joint between the barrel and a chunk of aluminum hanging off the muzzle, and the question is whether that joint behaves like part of the barrel during the shot cycle or whether it is allowed to shift even a tiny amount. A high flow valve and a high regulator pressure put more air and more vibration through the front of the rifle on every shot, and if the moderator can move even slightly against its adapter, that movement can show up on paper as a flyer you cannot explain.
The V2 base lets you remove that variable. In our internal testing on the Yokozuna V2 base we saw a dramatic drop in shot cycle vibration, especially on PCPs with high flow valves and those running high regulator pressures, and because the RYU QD 2.0 runs the same mechanism it is built to solve the same problem on a smaller moderator. For me, that is really what precision is about, because it is not just about one small group, it is about the system repeating itself shot after shot without anything in the chain shifting around.
Bore Alignment: Why a Concentric, Solid Mount Matters
The first thing a good QD system has to do is hold the moderator dead center on the bore, because every baffle in a RYU has a hole drilled for a projectile traveling straight down the middle. When the mount is concentric, the pellet or slug leaves the crown and travels through the center of every baffle with even clearance all the way around it, and that is the whole reason the caliber-specific bore sizes on our moderators work the way they are supposed to.
When the mount is off center, or when it is allowed to move during the shot, a few bad things can happen. The obvious one is a clip or a baffle strike, where the projectile touches a baffle on its way out, which can damage the moderator and will almost always send that shot somewhere you did not want it to go. The less obvious one is what happens to the air. Right as the projectile exits the crown, it is surrounded by a burst of high pressure air, and if the baffles are sitting off center that air does not release evenly around the projectile. One side sees more gas than the other, and that uneven push at the muzzle is enough to disturb a pellet, which is a lot more sensitive to it than a heavy slug.
This is where the V2 base earns its keep. Because you tension the adjuster until the movement is gone, the RYU seats solidly on the adapter instead of floating on a spring, so the moderator stays where it was aligned during the shot cycle rather than shifting under the pulse of a high pressure valve. That gives you a consistent gas release around the projectile shot after shot, it protects the baffles from strikes, and it makes the moderator safer for the long haul, which matters to me because a moderator that gets clipped once is never quite the same moderator again. The one thing the V2 base cannot fix is a crooked adapter, so take your time threading the QD barrel adapter on squarely before you set any tension.
Returning to the Same Index Every Time and Why It Protects Precision
The RYU uses an indexed locking system, which means the base only seats one way on the adapter. PJ shows this in his video, where the spot on the base with the set screw lines up with the lug that has the dimple before you twist it on, and that means the moderator goes back to the same clocked position and the same seating depth every time you mount it.
I always separate precision from accuracy, because they are not the same thing. Precision is the ability of the whole system to shoot tiny groups consistently, while accuracy is where that group lands on the target, and accuracy is the part you can dial with the turrets. A moderator that sits a little differently every time you put it on attacks both, but the precision side is the one that really hurts, because it is not something you can dial out.
When the RYU returns to the same index, its weight hangs off the barrel in the same place, its contact points against the adapter are the same, and the gas flows through the same baffles in the same orientation as the last time you shot it. Everything the moderator does to the shot is repeatable, so the group shape you built your load and tune around stays the same, and so does your point of impact. That is why you can pull the RYU off for storage, transport or cleaning, put it back on, and keep shooting without re-zeroing or chasing a shift. I would still confirm zero with a couple of shots after any change, because that is good practice with any setup, but you should not be fighting the moderator to get your group back.
How the V2 QD Mechanism Works, Step by Step
PJ put together a really clear walkthrough of the V2 base when it launched on the Yokozuna, and since the RYU QD 2.0 uses the same mechanism, his process is the one I would follow on the RYU as well. He demonstrates it on an FX Leopard wearing a 1/2 x 20 barrel adapter, and I have embedded the video here so you can watch it before you set yours up.
The RYU QD 2.0 as shown on the product page: the V2 QD base, the RYU body, the adjustment tool and the Allen key for the set screw.
1. Install the barrel adapter and separate the base
Start by threading the QD barrel adapter onto your airgun. Then unthread the V2 base from the rest of the moderator so you can get at the adjuster inside, and keep the body sections somewhere clean while you work.
2. Back out the nylon-tipped set screw
On the side of the base there is a small grub screw, which is not the same thing as the little dimple next to it. Use the included Allen key to back that set screw out, and put it somewhere safe, because it has a small nylon tip on it and it is exactly the kind of part that disappears into the carpet. That set screw is what locks the adjuster in place once you have your tension set.
3. Find the internal adjuster and seat the washer
Look into the base from the baffle side and you will see a center piece with an open plus-sign pattern, and that piece rotates. The included adjustment tool engages that plus sign so you can turn it easily. Before you go any further, take the washer out of the small bag of parts and seat it inside the base on the baffle side.
Looking into the V2 base from the baffle side. The plus-sign center piece is the adjuster, and the tool turns it.
4. Index the base onto the adapter and set the tension
Line up the spot on the base with the set screw hole with the lug on the adapter that has the dimple, then push the base on and twist it to lock. The first time you do this it will feel loose, which is normal, because you have not adjusted anything inside yet. Put the tool into the adjuster and tighten it until there is minimal movement, then go a little bit tighter from there.
If you want the lock-up a little firmer, PJ shows that the easiest way is to take the base back off the gun and give the adjuster about a quarter turn righty tighty, then put it back on. Repeat that until the lock-up is as solid as you want it, and remember that you, the shooter, are the one deciding how tight it is.
5. Lock the adjuster and thread on the baffle stack
When the tension is where you want it, thread the nylon-tipped set screw back in to lock the adjuster in position, and check that there is no wiggle when you put it on and take it off. After that it is as simple as threading the baffle stack back on, and you have a moderator that is tensioned specifically for your rifle. If it ever starts to feel like it is not as tight as you would like, loosen the set screw, give it another small turn, and lock it back down.
The V2 base with its adapter pieces and the Allen key laid out for setup.
How the Adjustment Tool and V2 QD Base Fit Your Specific Airgun
Here is something people outside the shop do not always think about. Airguns are not all machined to the same tolerances, and that is true between different makers and even between two rifles of the same model. The thread cut on a barrel or shroud can be slightly looser or tighter, the shoulder the adapter seats against may not be perfectly square, the usable thread depth varies, and the way a given adapter fits on a given rifle is never exactly the same twice. Each of those differences is small, but they stack up, and with a fixed spring tension a QD mount has to live with whatever play that stack leaves behind.
The V2 base takes a different approach, which PJ sums up nicely in his video when he says that you, the end user, get to set how tight the lock-up is. Instead of a spring with one tension for every rifle, the base has an internal threaded adjuster with that plus-sign center piece, and the included adjustment tool is what turns it. You mount the base on the barrel adapter that is actually on your rifle, tighten the adjuster until the movement is gone, go a little tighter, and if you want it firmer you take it off, give it about a quarter turn and try again. Then the nylon-tipped set screw locks that setting in, so the base keeps the tension you set for that rifle.
What that means in practice is that the lock-up is fitted to your gun and your adapter rather than to an average one. With the play taken out, the base seats firmly against the adapter, it stays where it is aligned during the shot cycle, and the indexed lug and dimple bring it back to the same clocked position every time you mount it. PJ calls the end result a moderator adjusted specifically for your airgun, and that is exactly how I think about it.
Two honest notes so you set it up right. The adjuster sets lock-up tension, it does not re-cut a crooked thread or square a shoulder that is off, so the most important step is still threading the QD barrel adapter onto the rifle squarely and snug. And because the tension is fitted to one adapter, if you move the RYU to a different rifle, check the lock-up the first time you mount it there and readjust if it needs it. The adjustment tool comes with the V2 QD base, and some shooters like to put a 4mm Allen wrench, which is not included, into the narrow end of the tool for a little more leverage.
Same V2 Mechanism as the Yokozuna V2 QD
If you already run a DonnyFL Yokozuna V2 QD, the RYU QD 2.0 will feel familiar, because it is the same V2 mechanism in a smaller moderator. The Yokozuna is 1.6 x 7.25 inches with the same outside diameter as our Sumo, so it is the bigger, higher volume option, while the RYU at 1.22 x 5.25 inches is the one I reach for on a light hunting rifle or a shorty build where length and weight matter.
For Yokozuna owners who are still on the original spring base, the Version 2 QD Base for the Yokozuna M80B is sold on its own and is compatible with all versions of the Yokozuna and all DonnyFL QD barrel adapters. We covered that setup in detail in our Yokozuna V2 QD Field Notes.
The Version 2 QD Base for the Yokozuna, the same V2 mechanism the RYU QD 2.0 now uses.
Shop the DonnyFL Yokozuna V2 QD
Fitting the RYU QD 2.0 to Your Airgun, Whatever the Make
The RYU QD 2.0 is not built around one brand of rifle, and that is the point. We want this QD system to be something every PCP shooter can use, so the fitment question is really just a thread question. The V2 base locks onto a DonnyFL QD Barrel Adapter, and that adapter threads onto your airgun. Every RYU QD 2.0 is 1/2 x 20, and the QD Barrel Adapter itself is available in 1/2 x 20, M14x1, M14x1.25, M18x1 and M20x1, so the job is to get a thread on the end of your barrel or shroud that one of those adapters can go onto.
Step 1: Figure out what thread your airgun has
Some rifles come from the factory with a usable thread on the barrel or the end of the shroud, and some do not. Check your owner's manual or the manufacturer's spec for the thread pitch, and pay attention to whether it is a male thread on the outside or a female thread on the inside, because that changes which adapter you need. Our thread pitch guide walks through 1/2 x 20 UNF, M20x1, M18x1, M14x1.25 and the others you will run into.
Step 2: Pick the model-specific or universal adapter
If your rifle does not have a thread the QD Barrel Adapter can go onto directly, a model-specific adapter is the bridge. The DonnyFL airgun adapters collection covers a long list of makes, including AEA, Air Arms, AirForce, Air Venturi, Ataman, Benjamin, Brocock, Diana, Evanix, FX, Hatsan, Huben, Kalibrgun, Kral, Sam Yang, Taipan and Umarex, and each listing names the specific models it fits. Search the collection for your exact model and only order the adapter that names it.
For rifles that already have a thread but not the right one, there are universal options too, like the M14x1 to 1/2 x 20 Adapter A89, the M14x1.25 to 1/2 x 20 Barrel Adapter A98, the 1/2 x 20 Double Male Adapter A21 for turning a female 1/2 x 20 thread into a male one, and the Slide On Adapter with 1/2 x 20 UNF for bare barrels. We covered all of those in more depth in our universal airgun moderator adapters Field Notes.
Find the Adapter for Your Airgun
Step 3: Size the RYU for how it mounts
Once you know how it is mounting, the sizing rule is the same one we use across the whole DonnyFL line. If the QD Barrel Adapter threads directly onto a threaded barrel, buy the same caliber as your airgun. If you are going onto a shroud or stacking a thread adapter in between, go one caliber size up, because every extra joint adds a little opportunity for misalignment and the extra bore clearance protects you from a baffle strike. If you are not sure which way your rifle falls, reach out to us before you order and we will help you sort it out.
One RYU, several rifles
Because the RYU is quick detach, a Quick Disconnect (QD) Barrel Adapter on each rifle lets one moderator move between guns. The adapter is available in 1/2 x 20, M14x1.25, M14x1, M18x1 and M20x1, and it is the barrel adapter only, not a moderator rear cap. Before you move the RYU from one rifle to another, make sure the caliber sizing still makes sense for both, and since the V2 base tension is set to a specific adapter, check the lock-up on the new rifle the first time you mount it.
Harmonic Tuning: Adding and Removing Baffle Sections
Every barrel vibrates when a shot goes off, and the muzzle is whipping through a small pattern while the projectile is still traveling down the bore. Where the muzzle happens to be in that pattern at the moment the projectile exits has a lot to do with how tight your groups are, and if the projectile is leaving at a point where the muzzle is moving the most, small differences from shot to shot turn into spread on the target.
Hanging a moderator on the end of the barrel changes that vibration, because you are adding length and mass right where the whip is happening. Since the RYU is modular, adding or removing baffle sections changes that length and mass, and that means the moderator can act a lot like a barrel tuner. The goal is to find the configuration where the muzzle is in a consistent spot at exit for your projectile and your velocity, so a pellet at one speed might like a different stack than a slug at another. If you change the projectile or the power level, it is worth checking whether the stack length that worked before still works.
I have done exactly this with the bigger Yokozuna. When I was preparing for RMAC 2025 on the FX King .30 in the bronze Saber Tactical chassis, I shot it at 100 yards from 850 to 920 FPS in 5 FPS steps while removing baffles one at a time, and the rifle finished the test with 2 baffles removed. We covered the method in our Field Notes on using the Yokozuna as a harmonic barrel tuner, and the same idea applies to the RYU on a smaller scale. I have not run that test on the RYU QD 2.0, so I am not going to give you numbers for it, but the approach is the same, change one thing at a time, shoot enough to see the group, and write down what you find.
The tradeoff: suppression versus length and weight
There is always a balance to manage. More baffle sections give the air more volume and more stages to slow down in, which generally helps suppression, while fewer sections keep the rifle shorter, lighter and handier, which is the whole reason I like the RYU on light hunting builds. You might find that the stack your barrel likes best is not the longest one, and that is fine, because a slightly shorter stack that groups well is worth more than a longer one that is a touch quieter and scatters. Just stay within our limit of no more than 2 extra baffles on top of the factory unit, and go up a caliber if you plan to go longer.
Spare Baffles, Threaded Options and Maintenance
The RYU is modular, and the DonnyFL Spare Baffles for the RYU let you lengthen it or replace individual sections. Our recommendation is not to add more than 2 extra baffles on top of the factory unit, and if you plan to go longer than that, go one caliber size up for more bore clearance, because a longer stack gives the projectile more length in which a small misalignment can turn into contact.
If you know your moderator is going to live on one rifle and you would rather have a direct thread than a quick detach, the RYU with the 1/2 x 20 Threaded Housing gives you the same modular body without the QD base.
On the maintenance side, the RYU uses O-rings and a washer rather than felt, and the Ryu Refresh Kit M148 includes 5 replacement O-rings and 1 washer for all RYU models. Our moderator maintenance Field Notes cover the full cleaning and inspection routine.
RYU QD 2.0 Setup Checklist
Same caliber as the gun on a threaded barrel, one size up on a shroud or adapter.
Thread the QD barrel adapter on squarely before you touch the base.
Back out and save the nylon-tipped set screw, seat the washer, then tension the adjuster until movement is gone, plus a little more.
Lock the adjuster with the set screw and confirm there is no wiggle on and off.
Re-check the lock-up any time you move the RYU to a different rifle or adapter, and confirm your zero.
Frequently Asked Questions
What is the DonnyFL RYU QD 2.0?
The RYU QD 2.0, listed as the DonnyFL RYU v2, is our 1.22 x 5.25 inch modular RYU moderator on the V2 QD base, a tailored fit system that gets set up for your individual rifle. It is offered in .22, .25 and .30 with 1/2 x 20 threads.
What is the difference between the original RYU QD and the RYU QD 2.0?
The original RYU uses a spring inside the QD base to hold tension. The RYU QD 2.0 replaces that spring with an internal threaded adjuster, so you set how tight the moderator locks up on your barrel or shroud and the potential movement of a spring is taken out of the system.
Is the RYU QD 2.0 the same QD mechanism as the Yokozuna V2?
Yes. The RYU QD 2.0 uses the same V2 QD mechanism as the Yokozuna V2 QD, in a smaller 1.22 x 5.25 inch moderator, and the RYU v2 product page links to the same V2 install and adjustment video PJ made for the Yokozuna.
How do I tighten the V2 QD base?
Back out the nylon-tipped set screw, seat the washer, mount the base on the barrel adapter, then turn the internal adjuster with the included tool until there is minimal movement and go a little tighter. For a firmer lock-up, remove the base and give the adjuster about a quarter turn, then lock it with the set screw.
What size RYU QD 2.0 should I buy for my airgun?
Buy the same caliber as your airgun if you are threading directly onto a barrel, and go one size up if you are going onto a shroud or through an adapter. For example, a .22 rifle mounting through a shroud adapter would use a .25 RYU.
Will the RYU QD 2.0 fit my airgun?
The RYU QD 2.0 is designed to work across PCP airgun makes. It locks onto a DonnyFL QD Barrel Adapter, available in 1/2 x 20, M14x1, M14x1.25, M18x1 and M20x1, and if your rifle needs it, a model-specific adapter from the DonnyFL airgun adapters collection gets you to one of those threads. Search the collection for your exact model before ordering.
Which airgun brands have DonnyFL adapters?
The DonnyFL airgun adapters collection includes adapters for makes such as AEA, Air Arms, AirForce, Air Venturi, Ataman, Benjamin, Brocock, Diana, Evanix, FX, Hatsan, Huben, Kalibrgun, Kral, Sam Yang, Taipan and Umarex, and each listing names the specific models it fits.
Can one RYU QD 2.0 be shared between rifles?
Yes. Put a DonnyFL QD Barrel Adapter on each rifle, available in 1/2 x 20, M14x1.25, M14x1, M18x1 and M20x1, and check the lock-up and your zero the first time you mount the RYU on each one.
How does the V2 QD base adapt to my specific airgun?
Airguns vary in thread cut, shoulder squareness, thread depth and adapter fit, even between rifles of the same model. Instead of a fixed spring, the V2 base has an internal threaded adjuster you turn with the included tool while the base is mounted on your own barrel adapter, so you set the lock-up tension for that rifle and lock it with the nylon-tipped set screw. It sets tension, so thread the barrel adapter on squarely first.
Is the V2 QD adjustment tool sold separately?
The adjustment tool comes with the V2 QD base. Some shooters add a 4mm Allen wrench, not included, in the narrow end of the tool for extra leverage.
Why does bore alignment matter on an airgun moderator?
A concentric mount keeps the pellet or slug traveling through the center of every baffle with even clearance. That avoids clips and baffle strikes, and it lets the air at the muzzle release evenly around the projectile instead of pushing harder on one side, which can disturb a pellet and open up groups.
How does the V2 QD base help bore alignment?
Because you tension the internal adjuster until the movement is gone, the RYU seats solidly on the QD barrel adapter instead of floating on a spring, so it stays where it was aligned during the shot cycle. Thread the barrel adapter on squarely first, since the base cannot correct a crooked adapter.
Why does returning to the same index improve precision?
When the moderator seats in the same clocked position every time, its weight, contact points and gas flow are the same as the last time you shot it, so your group shape stays consistent and your point of impact stays put after taking it off and putting it back on.
What is the difference between precision and accuracy?
Precision is the ability of the whole system to shoot tiny groups consistently. Accuracy is where that group lands on the target, and it can be adjusted with your scope. A repeatable moderator index protects both, but precision is the part you cannot dial back in.
Can adding or removing RYU baffle sections tighten my groups?
It can. Changing the length and mass on the end of the barrel changes how the barrel vibrates, so the RYU can work like a barrel tuner. Change one section at a time with your projectile and velocity, and keep the configuration where the groups are tightest, staying within 2 extra baffles before going up a caliber.
Does a longer RYU stack always mean better suppression?
More sections generally give the air more volume to slow down in, but they also add length and weight. The best stack for your rifle is a balance between suppression, handling and the length your barrel groups best with.
Does the RYU QD 2.0 change point of impact when I take it off?
The RYU uses an indexed locking system, so it returns to the same position every time, which is designed to give you no point of impact change after detaching and reattaching.
Final Thoughts
The RYU has been my favorite small moderator for light, handy rifles for a long time, and the V2 base adds something I really like on a quick detach moderator, which is a lock-up I get to set myself. On a small QD moderator that is going to live on a high pressure PCP, taking the movement out of that joint is a change aimed squarely at precision, because it removes one more thing that could shift between shots.
If you are setting one up, watch PJ's video first, take your time with the set screw and the adjuster, and set the tension for the rifle it is actually going to live on. If you are still deciding between the RYU and something bigger, our guide to choosing a DonnyFL moderator by caliber, power and rifle and the full DonnyFL airgun moderators collection are good places to start, and if you have any questions about sizing or adapters for your airgun, reach out to us before you order and we will help you get it right.
