Battle Arms Development WORKHORSE, Upper Receiver Assembly, 223 Remington/556NATO, 10.5" Barrel, Carbine-length Gas System, Anodized Finish, Black, A2 Flash Hider, WORKHORSE 9.5" M-LOK Free Float Handguard, Does Not Include Bolt Carrier Group or Charging Handle WH-UR-10.5-556

Available from Battle Arms Development, the WORKHORSE® 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
• Receiver Type: M4

Handguard Type: WORKHORSE® 9.5in M-Lok® Free Float Rail and WORKHORSE® 15” M-LOK Free Float Rail

• Overall Length: 18.5” or 24.5”
• 10.5” Barrel: Rosco Manufacturing 10.5in 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with a .750"" diameter low-profile gas block, WORKHORSE® 9.5in M-Lok Free Float Rail, and an A2 flash hider.
• 16” Barrel: Rosco Manufacturing 16in 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with a .750"" diameter low-profile gas block, WORKHORSE® 15in M-Lok Free Float Rail, and an A2 flash hider.
• Upper: Forged 7075-T6 AR upper is hard coat anodized black for durability. Featuring M4 feed ramp cuts, these upper receivers are made in the USA.