RTB Complete 18" 5.56 Upper Receiver | A2 | 15" M-LOK | with Bolt Carrier Group and Charging Handle
**This Product Ships FULLY ASSEMBLED***
This complete 18-inch M-LOK upper receiver comes with our RTB 15-inch free float handguard and is built with only the best mil-spec components. The heart of this upper is comprised of a 4150 barrel and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.
|
Barrel
|
Specifications
|
|---|---|
| Caliber | 5.56 |
| Length | 18" |
| Material | 4150 Chrome Moly Vanadium |
| Profile | Government |
| Finish | QPQ Corrosion Resistant |
| Gas System Length | Rifle Length |
| Gas Block Journal | .750" |
| Dimpled? | Yes |
| Twist Rate | 1:7 |
| Muzzle Thread | 1/2x28 TPI |
| Weight | 30.4oz |
| Barrel Extension | M4 Feed Ramps |
| Target Crown | 11 Degree |
Bolt Carrier Group:
- Enhanced 9310 Steel (Bolt)
- 8620 Tool Steel (Carrier)
- Bolt is shot Peened and MPI
- All BCG components are pre-polished before being processed and then post polished for an incredible shine
Upper Receiver:
- Machined from a Mil-Spec 7075 T6 forging
- Cerakote or Hard Coat Anodized per Mil-A-8625F, Type III
- M4 Feed ramps
- Made in the U.S.A.
Handguard:
- MATERIAL: HARD COAT ANODIZED OR CREAKOTED ALUMINIUM
- PRECISION BORE
- ACCEPTS M-LOK RAIL SECTIONS & ACCESSORIES
- 7075-T6 ALUMINIUM BARREL NUT
- RAIL LENGTH IS MEASURED ALONG THE TOP
- INNER DIAMETER: 1.36"
Charging Handle:
- Tried and True Standard Charging Handle
- Forged 7075 Aluminum construction
- Mil-Spec Type-III Hardcoat Anodized finish
- Caliber - .223 / 5.56 / 300 Blackout
- Made in the USA
Please Note: Uppers may present light fouling from our quality control process and/or test firing
***Please allow an additional 2-3 business days of lead time as these uppers are made to order.***
