AR-15 22lr Barrel & Bolt Kit 9" MT
$289.99 at OpticsPlanet · 5 stores
In stock Sale
Best price
$284.00at MidwayUSA
In stock checked Oct 21, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $284.00checked Oct 21, 2026 | In stock | Buy at MidwayUSA | |
| OpticsPlanet | $289.49Salechecked Oct 21, 2026 | In stock | Buy at OpticsPlanet | |
| Palmetto State Armory | $281.99checked Oct 2, 2026 | Check store | Buy at Palmetto State Armory | |
| CMMG | $299.95checked Oct 21, 2026 | Check store | Buy at CMMG | |
| Brownells | $312.31checked Oct 21, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $279.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $312.31 | $312.31 | $312.31 |
| CMMG | $299.95 | $299.95 | $299.95 |
| MidwayUSA | $284.00 | $284.00 | $289.99 |
| OpticsPlanet | $289.49 | $279.99 | $294.49 |
| Palmetto State Armory | — | $281.99 | $281.99 |
Since Sep 27, 2026.
About this part
The AR-15 4.5 Barrel & Bolt Group Kit MT 4140CM 22Lr is a .22 LR barrel from CMMG. It's sold by 5 stores (2 in stock), from $281.99 to $312.31. The lowest in-stock price in the last 30 days was $279.99 at OpticsPlanet.
Fits and works with
- Caliber
- .22 LR · Shop matching ammo
- Bolt
- .22 LR · Bolt carrier groups
Specifications
- Manufacturer
- CMMG
- Platform
- AR-15
From the manufacturer
An Easy Conversion to .22 LR for Your Upper Receiver
In this Barrel and Bolt Group Kit, CMMG provides everything you need to convert your AR-15 into a dedicated .22 LR rimfire training platform.
The barrel measures 4.5 inches long and is machined from 4140 chrome-moly steel, complete with a salt-bath nitride finish and a medium-taper profile. The barrel is optimized with a 1:16-inch twist that's compatible with most .22 LR bullets on the market, but the system runs best with 36-grain round-nose bullets.
Each .22 LR Barrel and Bolt Group Kit from CMMG also features a .22 LR sporting chamber, as well as a threaded muzzle measuring 1/2-28 TPI thread pitch. CMMG recommends using a round-style hammer in place of a notched hammer to avoid function issues. The only other piece of the kit needed for a functioning system is a dedicated .22 LR magazine.
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