AR-15 4.5 Barrel & Bolt Group Kit MT 4140CM 22Lr
$289.99 at MidwayUSA · 4 stores
In stock
Best price
$289.99at OpticsPlanet
In stock Sale checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $289.99Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| MidwayUSA | $299.99checked Oct 1, 2026 | In stock | Buy at MidwayUSA | |
| CMMG | $324.95checked Oct 1, 2026 | Check store | Buy at CMMG | |
| Palmetto State Armory | $347.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $335.38checked Oct 1, 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: $289.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $335.38 | $335.38 | $335.38 |
| CMMG | $324.95 | $324.95 | $324.95 |
| MidwayUSA | $299.99 | $299.99 | $299.99 |
| OpticsPlanet | $289.99 | $289.99 | $289.99 |
| Palmetto State Armory | $347.99 | $347.99 | $347.99 |
Since Sep 28, 2026.
About this part
The AR-15 22lr Barrel & Bolt Kit 9" MT is a 9" .22 LR barrel from CMMG. It's sold by 5 stores (2 in stock), from $289.99 to $347.99. The lowest in-stock price in the last 30 days was $289.99 at OpticsPlanet.
Fits and works with
- Caliber
- .22 LR · Shop matching ammo
- Bolt
- .22 LR · Bolt carrier groups
- Muzzle thread
- 1/2x28 · Muzzle devices
- Barrel length
- 9" · Handguards
Specifications
- Manufacturer
- CMMG
- Platform
- AR-15
- Caliber
- .22 LR
- Barrel length
- 9"
- Twist rate
- 1:16
- Thread pattern
- ½ x 28
From the manufacturer
This CMMG Barrel and Bolt Kit has the key components of what you need to convert your existing upper to a dedicated .22LR. For best performance use a round style hammer as notched hammers can cause function issues and 36 grain plated nose bullets have proven to be the best choice for function. 9a ^2 Barrel length 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:16 Twist 22LR Sporting Chamber Threaded 1/2-28 Mfg: Cmmg
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