The CMMG .22 LR Barrel and Bolt Group Conversion Kit, 9-Inch (CMMG part no. 22D8FEF) turns an existing upper into a dedicated .22LR. CMMG supplies a 9-inch barrel and the matching bolt group, so you only need to add a magazine. CMMG notes that a round-style hammer gives the best performance, since notched hammers can cause function issues. It also reports that 36-grain plated nose bullets have proven to be the best choice for function. It is an inexpensive way to shoot rimfire on an AR.

Key Specifications

• The caliber is .22 LR, a dedicated rimfire setup.
• The barrel length is 9 inches, a compact length for a pistol-style build.
• The kit is a barrel and bolt group, the parts that convert an existing upper.
• The kit weighs 1.65 pounds, per CMMG.
• A magazine is purchased separately, as CMMG states that you only need to add one.
• CMMG recommends a round-style hammer, because notched hammers can cause function issues.

Frequently Asked Questions

What do I need besides this kit? CMMG says you only need to purchase a magazine to be ready to shoot.

What ammunition works best? CMMG states that 36-grain plated nose bullets have proven to be the best choice for function.

Which hammer should I use? CMMG recommends a round-style hammer, because notched hammers can cause function issues.

Buy the CMMG .22 LR Barrel and Bolt Group Conversion Kit, 9-Inch

A rimfire conversion trims the cost of range time on an AR. Browse more AR-15 barrels from CMMG. Order from our Lubbock, Texas gun shop for fast, direct shipping.