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



PRI AR-15 Mark 12 Mod 0 SPR Upper Receiver Assembly For Sale

The PRI AR-15 Mark 12 Mod 0 SPR Upper Receiver Assembly is ready to shoot 5.56 upper, equipped with an 18″ Douglas 416 stainless steel barrel with a fitted bolt and retail bolt carrier. But the PRI mk12 upper has a flat-top Picatinny receiver, PRI flip-up front gas block show sight/rear sight, and rifle-length gas tube. 

It also comes with a Gas Buster setting handle with a large latch and an OPS muzzle brake with a collar. The mk12 mod 0 upper Gen II comes equipped with a carbon fiber-free float forearm the length of a Gen III rifle in either a black or flat dark earth finish. The full-length top rail also comes with a removable PEQII rail section.

What is PRI mk12 upper?

The PRI mk12 handguard top is a 16.5″ barrel with MOA capabilities. Available in Black and Flat Dark Earth. Note: Top assemblies have a flat rate shipping fee of $1,356.00 per group to the continental United States and a $50 shipping fee to Alaska and Hawaii.

What is a MK 12 upper?

The precision reflex mk12 firearm is the evolution of the special-purpose rifle. But it’s constructed almost an 18-inch Stainless Steel barrel with a chamber built during the Cold Hammer Forging process, ensuring the room’s most precise alignment to the bore possible.


  • Forged Upper Receiver T6 7075 Hard coat anodized aluminum
  • Douglas 416 stainless steel 18″ Barrel with M4 feed ramps
  • Flip up the 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
  • The rear Sight was 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 the United States of America


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



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