Few platforms in modern precision shooting have achieved the reputation and versatility of the FX Impact M3 and FX Impact M4. These airguns have become the benchmark for tunable PCP air rifles because they were designed from the ground up to adapt to multiple disciplines. Whether you are dialing in slug performance on the bench, competing in long-range airgun matches, or heading out for pest control and small game hunting, the FX Impact provides a level of configurability that few other airguns can match.
One of the biggest reasons the FX Impact continues to dominate the airgun world is the ecosystem of upgrades that allow shooters to tailor the platform to their specific shooting style. Among those upgrades, the Saber Tactical RFB Precision Buttstock has become one of the most impactful improvements you can make to either the FX Impact. RFB stands for Rear Field & Bench, and that name perfectly reflects the philosophy behind the design. It was created to give shooters a rear stock system that performs equally well whether the airgun is being used on the bench for precision tuning or in the field for hunting and pest control.
The result is a buttstock that enhances stability, ergonomics, and shooter control while maintaining the modular DNA that makes the FX Impact such powerful airgun platform.
Precision Stability for the FX Impact
The Saber Tactical RFB (Rear Field & Bench) Precision Buttstock was designed specifically to complement the precision capabilities of the FX Impact M3 and FX Impact M4. Machined from durable 6061 T6 aluminum, the RFB creates a rigid and stable interface between the shooter and the airgun. That rigidity matters when you are pushing the FX Impact to their limits, particularly when shooting heavy slugs or dialing in precise regulator and hammer spring combinations.
On an air rifle capable of extreme accuracy like the FX Impact, even small inconsistencies in the shooter interface can affect results. The aluminum construction of the RFB eliminates flex and provides a solid rear platform that enhances repeatability shot after shot. The moment you install the Saber Tactical RFB on an FX Impact, the airgun immediately feels more planted and predictable when settling in behind the optic.
Benchrest Performance with the Integrated Bag Rider
Where the Saber Tactical RFB Rear Field & Bench Buttstock really shines is in bench shooting applications. Anyone who has spent time tuning an FX Impact knows how critical rear bag control can be when chasing small groups at distance. The integrated bag rider built into the RFB creates a long, flat surface that slides smoothly across a rear bag, allowing shooters to make extremely fine elevation adjustments.
When tuning an FX Impact, consistency in your shooting position is just as important as regulator pressure or hammer spring tension. The bag rider allows the air rifle to move in a straight, predictable line, eliminating the rocking motion often found with traditional rounded buttstocks. This stability transforms the FX Impact into a purpose-built bench platform capable of producing remarkable accuracy.
Over countless hours of testing and tuning with the FX Impact, I have come to appreciate how much this design feature improves the shooting experience. Whether you are dialing in a new slug, adjusting regulator settings, or refining a tune, the RFB bag rider keeps the airgun steady and allows you to focus on wind conditions and shot execution instead of fighting your rear support.
Field Performance for Pest Control and Hunting
While the FX Impact are well known for their precision capabilities, they are equally at home in real-world field environments. Over the years I have spent a lot of time running the FX Impact during pest control and small game hunts in Utah, where the terrain and shooting conditions can change quickly.
In those situations, the Rear Field & Bench design philosophy of the RFB becomes immediately clear. The rubberized shoulder pad helps anchor the FX Impact firmly into the shooter’s shoulder, improving control during follow-up shots and keeping the airgun stable when shooting from improvised field positions.
While PCP airguns generate very little recoil compared to firearms, high-powered tunes in the FX Impact can still create movement during the firing cycle, especially when launching heavier slugs. The rubberized shoulder interface absorbs that movement and helps keep the air rifle planted, which becomes noticeable when shooting off sticks, a tripod, or natural field rests.
Sling Support and Practical Carry
Another feature that becomes particularly useful in field environments is the integrated quick-disconnect sling mount built into the RFB buttstock. When carrying an FX Impact across fields, desert terrain, or wooded areas, having a reliable sling attachment point can make a significant difference in comfort and mobility.
Because the FX Impact M3 and FX Impact M4 can be configured with larger bottles, extended barrels, and various accessories, the airgun can become substantial in weight. A properly mounted sling allows shooters to carry the FX Impact comfortably without interfering with the airgun’s balance or optics.
Seamless Integration with Saber Tactical Accessories
Another strength of the Saber Tactical RFB Precision Buttstock is how seamlessly it integrates with other upgrades designed for the FX Impact. The buttstock works perfectly alongside the original Saber Tactical buttstock architecture and is compatible with additional accessories like the Saber Tactical cheek riser and the Saber Tactical Pro Universal Bench Monopod.
This compatibility allows shooters to build a fully customized rear support system for the FX Impact. By adjusting cheek height, monopod placement, and buttstock position, shooters can dial in the air rifle’s ergonomics to match their shooting style perfectly.
When combined with the tunable power system, adjustable regulators, and interchangeable barrels of the FX Impact, the RFB becomes part of a broader system designed for precision and adaptability.
Easy Installation for Immediate Upgrades
One of the best aspects of the Saber Tactical RFB Rear Field & Bench Buttstock is how quickly it can be installed. Upgrading the FX Impact does not require specialized tools or complex modifications. Within minutes, shooters can transform the rear of their airgun into a more stable and ergonomic shooting platform.
For many shooters, this ease of installation makes the RFB one of the simplest and most rewarding upgrades available for the FX Impact.
One Airgun, Multiple Roles
The reason the FX Impact M3 and FX Impact M4 have become such dominant platforms in the airgun world is their ability to serve multiple roles. A single airgun can move from a backyard practice session to a long-range competition environment and then out into the field for pest control or hunting.
The Saber Tactical RFB Rear Field & Bench Precision Buttstock enhances that versatility by providing a stable, ergonomic rear platform that adapts to each of those environments. Whether you are shooting the FX Impact off the bench while chasing tiny groups, running it in a competition setting, or carrying it across open terrain on a hunting trip, the RFB adds stability, control, and comfort to the platform.
For shooters who want to unlock the full potential of the FX Impact, the Saber Tactical RFB Precision Buttstock is more than an accessory. It is an upgrade that helps transform an already exceptional airgun into a truly versatile shooting system.
