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PRI AR-15 Mark 12 Mod 0 SPR Upper Receiver Assembly 5.56x45mm 18″ Barrel



Product Information

Cartridge 5.56x45mm NATO
Finish Black
Material Aluminum
Weight 5.2 Pound
Barrel Length 18 Inches
Twist 1:7 Inches
Threads 1/2″-28
Barrel Contour Standard
Sights Yes
Barrel Finish Black
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Rifle
M4 Feed Ramps Yes
Upper Receiver Type A4 Flat-Top
Barrel Material 416 Stainless Steel
Handguard Gen III Carbon Fiber Free Float
Bolt Carrier Assembly Included Yes
Muzzle Device OPS Muzzle Brake
Mil-Spec or Commercial Commercial
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight

7.200 Pounds

Product Overview

The PRI Mark 12 Mod 0 SPR Upper Receiver Assembly is a ready to shoot 5.56 upper, equipped with a 18″ Douglas 416 stainless steel barrel with a fitted bolt, and commercial bolt carrier. The Mark 12 Mod 0 SPR has a flat-top picatinny receiver, PRI flip up front gas block front sight/rear sight, and rifle length gas tube. It also comes with a Gas Buster charging handle with a big latch and OPS Muzzle Brake with collar. The Mark 12 Mod 0 SPR Gen II comes equipped with a Gen III rifle length carbon fiber free float forearm inĀ either black or flat dark earth finish. The full length top rail comes with an PEQII removable rail section as well.


  • Forged Upper Receiver T6 7075 Hard coat anodized aluminum
  • Douglas 416 stainless steel 18″ Barrel with M4 feed ramps
  • Flip up front sight gas block with 2 cross bolts for securing
  • Rifle Length Forearm with Black or FDE Finish
  • SPR Straight Fully Length Picatinny Top Rail with SPR PEQ II Removable Rail Section
  • Rear Sight designed for the gas block
  • 1/2″x28 Thread with OPS Muzzle Brake and Collar
  • Overall Length of 27″
  • Only 5.2 Pounds

Made In United States of America


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