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


Category: Product ID: 18941


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 in 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
  • Product Information

    Cartridge 5.56x45mm NATO
    Finish Flat Dark Earth/Black
    Material Aluminum
    Weight 5.2 Pound
    Barrel Length 18 Inches
    Twist 1:8 Inches
    Threads 1/2″-28
    Barrel Contour Standard
    Sights Yes
    Barrel Finish Flat Dark Earth
    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 7.205 Pounds


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