Precision Reflex’s Mark 12 Mod 0 SPR Gen II Upper Receiver is a complete, full-featured tactical upper that’s fully assembled and ready to shoot...once you install it on a mil-spec lower receiver. It is fitted with PRI’s Gen II Retro Carbon Fiber Forend that replicates the handguard of the U.S. Navy’s Mk 12 Mod 0 Special Purpose Rifle. You get a mile-long, uninterrupted expanse of Picatinny top rail extending from the rear of the receiver to the front of the forend. There are also short 3" lengths of Picatinny rail up front in the 3, 6 and 9 o’clock positions. The Mark 12 Mod 0 SPR Gen II Upper Receiver will deliver MOA accuracy right out of the box thanks to its free-floated, 18" Douglas barrel of high-grade 416 stainless steel with 1-7" target rifling and M4-type feed ramps. The bolt is custom-fitted to the barrel. And as the late-night infomercials say, that’s not all.

The SPR Gen II upper also offers:

• PRI Gas Buster charging handle with an easy-to-grasp oversized latch
• Precision Reflex Flip Up sights - elevation (front) & windage (rear) adjustable without tools
• OPS muzzle brake to tame recoil & muzzle rise during rapid fire
• 5.56x45mm NATO chamber accepts both military & civilian .223 Remington ammunition
• Rifle-length gas system cuts gas velocity to promote excellent reliability
• Non-reflective matte black finish on barrel, brake, receiver & forearm

The PRI Mark 12 Mod 0 SPR Gen II Upper Receiver delivers a unique combination of accuracy, performance, and versatility, but it’s pleasantly basic where it counts. The forged, mil-spec AR-15 flattop receiver comes with a standard commercial carrier, so compatibility with a mil-spec (.250" pivot/takedown) lower is no problem.