AR-15 Workhorse 10.5 Upper M-LOK 1-7 Twist 5.56 NATO
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specifications

Manufacturer:

Battle Arms Development Inc

Platform:

AR-15

Caliber:

5.56 mm NATO

    AR-15 Workhorse 10.5 Upper M-LOK 1-7 Twist 5.56 NATO

    Caliber Manufacturer Color Weight Merchant Price Merchant URL
    5.56 mm NATO Battle Arms Development Inc None None None $524.95 Brownells Add

    Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.

    Available from Battle Arms Development, the WORKHORSEA(R) Upper Receiver available in both 10.5" and 16" options! These upper receiver sets do not come with a Charging Handle or Bolt Carrier Group to allow for user customization. Barrel Length: 10.5" and 16" Gas System: Carbine Barrel Profile: A2 Barrel Steel: 4150 Chrome-Moly Vanadium Barrel Finish: Nitride Chrome Lining: None Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: A2 Flash Hider Receiver Material: Forged 7075 T6 R Mfg: Battle Arms Development Inc.

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