This Complete 10.5 inch M-LOK upper receiver comes with a 9 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.


Length - 10.5"
Material - 4150 Chrome Moly Vanadium
Profile - Government
Finish - QPQ Corrosion Resistant
Gas System Length - Carbine
Gas Block Journal - .750"
Twist Rate - 1:7 inches
Muzzle - 1/2x28 Threaded
Weight - 19oz
Other Info - M4 feed ramps

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 Hard Coat Anodized per Mil-A-8625F, Type III
M4 Feed ramps
Made in the U.S.A.


9" free float handguard
MIL-STD 1913 Picatinny rail on top
3 M-Lok slots on 3 sides
Precision Machined 6000 Series aluminum, for high strength and weight savings
Hard Coat Anodized per Mil-A-8625F, Type III, Class 2
Clamp on system for easy assembly
Steel Barrel nut to resist movement under heat
10 oz with barrel nut and hardware
1.35" Inside Diameter
1.63" Wide
Made in USA

Charging Handle:

Alloy Charging Handle Assembly
Complete with Standard Latch
Made from hardcoat anodized aluminum
Black finish
Please Note: Uppers may present light fouling from our quality control process and/or test firing

SKU: BG1055569A2-BLK

Coupons for Right To Bear store

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Comments (3)

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Has anyone had any experience with Builders grade company. This seems like too good of a deal for a complete upper with a BCG and charging handle

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RTB does unbranded stuff of a few products from their usual distributors. They’ll sell them next to each other with a small discount. Usually it’s CMMG or BA but I’m guessing this one is BCA. If you have gauges, you can save some money buying BCA. If you don’t, I wouldn’t risk the expense of a bad range day or two followed by the time to wait for warranty replacement. Now maybe RTB is good enough to gauge their uppers before shipping but that would be rare, especially given the label Builders Grade. As the builder, you’re responsible for checking things.

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I can say first hand they have incredible builds well worth the price

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