Description
Builder’s Grade Complete 4.5″ .22LRDedicated Upper Receiver | 4.5″ Mini Barrel | 4″ Free Float M-LOKHandguard | Dimpled Flash Can | with Bolt Carrier Group and Charging Handle
This mini .22 Rimfire Complete Upper Receiver comes with our 4.5-inch barrel and a 4-inch Free-Float MLOK rail, with the dimpled linear flash can compensator extending past the handguard. The bolt is made of all stainless steel construction and we use an anti-jam dedicated 22 charging handle.
Our complete 22LR upper receivers are fully compatible with CMMG or similar 22 components. Our barrels and bolts are fully interchangeable and follow the same pattern as CMMG.
Every upper is rigorously inspected before and after being test fired, so light fouling may be present.
Compatible with RTB/CMMG .22 magazines, which you can find here
- Caliber: 22LR
- Upper Receiver: Slick Side Forged 7075 T6
- Bolt: Stainless Steel Construction
- Barrel:4.5 inch / 1:16
- Handguard: 12 inch Free-Float M-LOK
- Muzzle Device:Dimpled Flash Can LinearCompensator
- Charging Handle: Anti-Jam 22lr
- Compatible with standard AR lower receivers
- Made in USA
| Barrel | Specifications |
|---|---|
| Caliber | .22LR |
| Length | 4.5″ |
| Material | 4140 CrMo |
| Profile | Medium Taper |
| Finish | SBN |
| Gas System Length | None |
| Gas Block Journal | N/A |
| Dimpled? | No |
| Twist Rate | 1:16 |
| Muzzle Thread | 1/2×28 |
Although .22lr AR builds do not utilize the functionality of a buffer or buffer spring, we still recommend using both to provide a stopping point/wall that prevents the 22 bolt carrier from moving rearward. Using a buffer and buffer spring will prevent light primer strikes. This is true for all Ciener/Atchisson 22 pattern platforms.
AMMO RECOMMENDATION:For in-house testing, we utilizeCCI .22LR Mini-Mag 36 Grain Copper-Plated Hollow Point Varmint Ammo (1,260 FPS). We highly recommend this ammunition for use with all RTB .22 uppers. It is important to note that the use of underpowered or economy-grade ammunition may lead to less-than-optimal performance outcomes.
All NFA/ATF Rules Apply
Depending on your state and local laws, you could use this barrel with a lower receiver that is a Registered SBR, or Pistol. Possession of this barrel along with a Non-NFA lower receiver may be Prohibited. We are not lawyers and the above information is not legal advise. Make sure you understand the most up to date federal, state and local laws before proceeding with this product.
