RTB Upper Build Kit 10.5" 300 BLK Upper Receiver - Black | A2 | 10" M-LOK | With BCG & CH
This build kit DOES NOT come assembled.
This Complete 10.5 inch M-LOK upper receiver build kit comes with our RTB 10 inch free float handguard and includes only the best Mil-Spec components for your AR15 build. The core components of this kit are a barrel that’s machined from chrome moly vanadium 4150 steel, the RTB lightweight handguard that’s machined from 6061-T6 aluminum, an M4 upper that is machined from 7075 T6 forgings, and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.
As a “do it yourselfers" or DIY enthusiast, you may prefer an AR-15 build kit over a complete upper. Building an AR-15 from a kit allows for a greater level of customization and personalization of the final product. DIYers can choose from a variety of components, such as barrels, handguards, and triggers, to create a rifle that meets their specific needs and preferences. Additionally, building an AR-15 from a kit can be a rewarding and educational experience, as it allows you to gain a deeper understanding of how their firearm functions and how to properly maintain it. Building an AR-15 from a kit may often be more cost-effective than purchasing a complete upper, as it allows DIYers to select only the components they need, rather than paying for pre-assembled parts they may not want or need.
We also carry this Upper Receiver Kit assembled here.
- 10.5" 5.56 4150 CMV Barrel - Black Nitride
- Medium Profile - .750" GB Journal
- 1:7 Twist Rate - 5/8x24 Muzzle Thread
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
- Machined from a Mil-Spec 7075 T6 forging Hard Coat Anodized per Mil-A-8625F, Type III
- M4 Feed ramps
- Made in the U.S.A.
- MATERIAL: BLACK ANODIZED ALUMINUM HANDGUARD, ALUMINUM BARREL NUT
- PRECISION BORE
- ACCEPTS M-LOK RAIL SECTIONS & ACCESSORIES
- 7075-T6 BARREL NUT
- RAIL LENGTH IS MEASURED ALONG THE TOP
- INNER DIAMETER: 1.36"
- 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