Surefire Shoulder Ring for SCAR 17/ 20

PMM is proud to carry the Surefire 762 shoulder ring and shim kit. The Surefire shoulder ring is being used as the standard in all PMM SCAR 17 & 20 barrel jobs.

PMM Highly Recommends the USE of the Surefire SCAR Should ring on ALL SCAR 17/MK20 Barrels

The Surefire shoulder ring solves all of the issues with fitting muzzle devices and suppressors to the FN SCAR 17/MK20 rifle. Due to the small shoulder available on the SCAR barrel from the factory, there are a very limited number of muzzle devices and mounts that will work properly. This ring increases the size of the shoulder by spreading the load of of the shoulder ring uniformly against the barrel shoulder. It also reduces the length of the muzzle threads to 0.60”, allowing any device or suppressor to be properly mounted.

Each kit includes shims with different thicknesses. The shims can be used alone or combined to achieve proper muzzle device alignment. Constructed from 300-series stainless steel for durability and long service life. Shims are color-coded—no need to measure to ensure proper thickness.

Instructions:

1. Verify that the rifle is unloaded and made safe
2. Thoroughly clean the entire muzzle thread profile of any debris, such as dried thread locker
3. Slip the surefire ring over the muzzle with the ID chamfer facing towards the muzzle device not the barrel
4. If installing a brake, space out and add the required washers or shims as needed to index properly
5. Clean, degrease, and dry the threads on the muzzle, and in the muzzle device
6. Add a few drops of the supplied Surefire Rocksett to the muzzle threads and threads of the muzzle device
7. Thread muzzle device onto the muzzle and snug ensuring the ring is seated correctly
8. Torque the muzzle device, but do not exceed 35 ft-lbs
9. Before firing, always verify proper bore alignment of any muzzle device and/or suppressor!

​PMM Surefire Shoulder Ring Install Video for the FN SCAR 17 Barrel.