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This CMMG Barrel & Bolt Group Kit takes an existing AR-15 upper and turns it into a dedicated .22 LR setup, which is one of the easiest ways to cut your ammo costs without buying a whole new gun. Instead of adapters and workarounds, you get a matched 4.5-inch barrel and a rimfire bolt group that were designed to run together, so the guesswork is off the table. Add a .22 LR magazine and you're ready to head to the range.
The barrel is machined from 4140 chrome moly steel and wears a salt bath nitride finish inside and out, which does a lot of the heavy lifting on corrosion resistance and makes cleanup after a dirty rimfire session a whole lot less of a chore. It carries a medium taper profile, a 1:16 twist that's well suited to standard .22 LR loads, and a 1/2×28 threaded muzzle so you can run a can or other muzzle device. The included bolt group is matched to the barrel, so you're not hunting around for compatible parts.
This is a conversion setup, not a complete upper, so you're pulling your centerfire barrel and dropping in the .22 LR barrel and bolt. Folks who've built these out report solid reliability once assembled, with bulk-pack rimfire running clean through it. A quick feed ramp polish and quality magazines like CMMG or Black Dog go a long way toward smooth cycling.
CMMG recommends running a round-style hammer rather than a notched one, since notched hammers can lead to function hiccups. For ammo, 36 grain plated nose rounds have proven to be the most reliable feeders, and copper-plated loads in that weight class tend to be the sweet spot for cycling. Backed by CMMG's lifetime quality guarantee, this kit is a straightforward way to build an affordable trainer or a fun plinking rig on hardware you already own.
The kit gives you the matched barrel and bolt group to convert your existing AR-15 upper, so the main thing you'll need to add is a .22 LR magazine. Blackdog-style and CMMG rimfire mags are popular choices. Beyond that, you'll want a barrel wrench and the usual assembly tools to swap the barrel over.
CMMG recommends 36 grain plated nose bullets as the most reliable feeders for this setup, and copper-plated rounds in that weight class tend to cycle the smoothest. Bulk-pack rimfire has been reported to run well once the rifle is assembled. Very light or economy-grade loads may not cycle as consistently.
CMMG advises using a round-style hammer rather than a notched one, since notched hammers can cause function issues with the rimfire bolt. Most standard mil-spec round hammers work fine. If you're running an aftermarket trigger, it's worth checking the hammer shape before install.
Yes, the muzzle is threaded 1/2×28, which is the common thread pitch for .22 LR suppressors and muzzle devices. That makes it easy to run a rimfire can for quiet, low-cost plinking. The barrel also carries a 1:16 twist that stabilizes standard .22 LR loads well.
| UPC | 815835016948 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22D5B6E |
| Length | 4.50" |
| Model | |
| Shipping Weight | 1.185 |
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