M14x1 to 1/2 x 20 Adapter A89
M14x1 to 1/2 x 20 Adapter A89 $35.00
Right handed threads to convert barrels with M14x1 to 1/2 x 20. Features: 16.05mm OD, 15.20mm deep on female side Black anodized and knurled throughout on the outside.
M14x1.25 To 1/2 x 20 Barrel Adapter A98
M14x1.25 To 1/2 x 20 Barrel Adapter A98 $25.00
This adapter is about 22mm OD x 38.30mm Length. It converts barrel threads from M14x1.25 to 1/2 x 20.  Does not come with a thread protector.  Features: 6061 T6 Aluminum Silver (no anodize)