Recommended for less than 25 yards, - CMMG 22LR Mk4 Barrel Kits w/ Bolt Group

The fit and finish of this kit seems to be adequate for use in the CMMG upper receiver that I put it in, and it seems to be reliable after putting an AR15 buffer/spring in the buffer tube.

- The accuracy appears to be pretty terrible.
- I recommend it for training inside of 25 yards or inside of structures, but it does not appear to be useful for grouping at 50 yards.
- It reproduces (close enough) the weight and balance of a standard rifle. It does NOT reproduce the muzzle flip of a standard rifle (if that wasn't obvious).
- When using the reliable S&W M&P15 22 magazines along with a drop-in magazine adaptor from Redi-Mag, last round bolt hold open works properly, so this is a decent option for emulating the AR15 manual of arms while using 22LR ammo.

***BE AWARE***

Mine requires the use of something to keep the bolt carrier cage from sliding slightly rearward (out the rear of the upper receiver) during recoil. When this occurs, it prevents the bolt from reliably returning to battery. A standard AR15 buffer and action spring solved the problem 100% so far.