Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3 holder, 20+ years behind the counter.
The CMMG 22LR AR conversion kit Bravo (model 22BA6AE) is a drop-in bolt carrier group assembly that converts any mil-spec AR-15 chambered in 5.56/.223 to fire .22 Long Rifle ammunition. You remove your standard BCG, insert this stainless steel unit, load one of the included 10-round magazines into your magwell, and you’re shooting rimfire. No permanent modifications to your lower receiver, no threading, no gunsmithing. A drop-in conversion kit is a self-contained firing system that includes its own bolt, firing pin, extractor, and magazine well adapter, enabling you to train at a fraction of centerfire cost while preserving your existing AR-15 platform. For shooters who log high round counts — new rifle owners working fundamentals, competitive shooters drilling transitions, or instructors running courses — this kit delivers chambering flexibility without building a second rifle.
The Mechanism
CMMG machines the bolt and carrier from 400-series stainless steel. The bolt face is recessed to capture the .22LR case rim; the firing pin floats freely and strikes the case head on battery. The extractor is spring-loaded and sized for rimfire case walls. The magazine follower adapter slides into your AR-15 magwell and holds the proprietary 10-round .22LR magazine, which feeds through a steel feed ramp integrated into the conversion unit. The carrier rides in your existing upper receiver without modification; the gas tube remains in place but is not used, because this is a blowback system. Each shot cycles the lightweight bolt rearward against buffer spring tension, ejects the spent case, strips a fresh round from the magazine, and returns to battery. The system requires no gas block adjustment, no buffer weight swap, and no change to your trigger group. CMMG recommends a round-style hammer (common in mil-spec and aftermarket AR triggers) rather than a notched hammer, which can cause light primer strikes with rimfire primers. The conversion weighs 36 ounces — heavier than a standard 5.56 BCG — so bolt velocity stays controlled and ejection remains consistent across ammunition brands.
Technical Breakdown
| Spec | Value |
|---|---|
| Platform | AR-15 |
| Cartridge Compatibility | 22LR |
| Bolt Material | Stainless Steel |
| Weight | 36 oz |
| Bolt Finish | 22BA6AE |
| MPN | 22BA6AE |
| UPC | 815835017143 |
This kit ships with three 10-round magazines. CMMG advises 36-grain plated round-nose bullets for best function; high-velocity hollow points and bulk 40-grain lead can cause feeding inconsistencies depending on chamber throat dimensions in your host upper. The conversion works in most 5.56/.223 chambered rifles with a mil-spec upper receiver and standard buffer tube. You can browse additional bolt carrier group options for your AR build on our platform.
Safe Handling & Compliance
This conversion kit does not alter the semi-automatic fire control of your AR-15. Each trigger pull fires one round. The host rifle must be legally owned and compliant with federal, state, and local law. Conversion to .22LR does not exempt the firearm from existing regulations.
- Treat every firearm as if it is loaded — visually and physically verify chamber and magazine status before handling.
- Verify your state and local laws permit ownership and use of the host AR-15 and .22LR ammunition before ordering.
- Clean the conversion bolt and chamber after every range session; rimfire ammunition leaves heavy fouling that can impair extraction and feeding if left unchecked.
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