Stratus OP511 Complete Upper, 5.56mm, 11.5” 4150 Chrome Moly Vanadium Steel Barrel, 1:7 Twist, QPQ Finish, A2 Flash Hider, Low-profile .750 Gas Block, SLR ION M-LOK or KeyMod Handguard, MilSpec Charging Handle
Barrel: 11.5″, 1-7 Twist, 4150 Chrome Moly Vanadium Steel w/ Nickel Boron Coated M4 Feed Ramps and Carbine Length Gas System – Black Nitride Finish, High Pressure Tested and Magnetic Particle Inspected
Muzzle Device: A2 Flash Hider
Gas Block: Ballistic Advantage Low-Profile .750, QPQ
Handguard: SLR ION 10.7” Lite MLOK or KeyMod
Upper Receiver: 7075-T6 Forged Aluminum, M4 Feedramps, Laser Engraved T-Marks
Bolt Carrier Group: M16, 9310 bolt, 8620 carrier, tool steel extractor and cam pin, properly staked grade 8 fasteners, and an incredible black nitride finish.
Charging Handle: MilSpec Charging Handle
All NFA/ATF Rules Apply
This upper receiver may be used with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this receiver along with a Non-NFA lower receiver is PROHIBITED, except when installed on a Pistol configured firearm.