Stratus OP511 Upper Receiver 11.5″ 5.56mm

(1 customer review)


Stratus OP511 5.56mm 11.5″ Upper Receiver

Out of stock

SKU: SOP51100 Category:


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 

Caliber: 5.56mm

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.

Additional information

Weight 3 lbs
Bolt Carrier Group

Enhanced Bolt Carrier Group, Standard Nitride BCG

Rail Attachment

MLok, KeyMod

1 review for Stratus OP511 Upper Receiver 11.5″ 5.56mm

  1. Mario M. (verified owner)

    Never Choose A Bargain Over Quality If Your Going To Do Something Do It Right …Nothing But Great Gear Here Thank You Stratus Armament Keep Up The Awesome Work

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