The Precision Reflex MK12 Mod 0 SPR Gen III 5.56mm 18" BBL 1-7 Twist Upper Black is a complete AR-15 upper receiver built around an 18" Douglas 416 stainless steel barrel and a rifle-length gas system. It features a flat-top receiver, full-length top rail, and Gen III carbon fiber free float forearm that keeps weight down while maintaining rigidity and consistent accuracy.

This upper comes ready to mount on a compatible AR-15 lower for range use, training, or precision shooting where a stable platform and repeatable performance matter. The included full auto bolt carrier, PRi flip up front gas block sight, rear sight, Gas Buster charging handle with big latch, brake and collar, and PEQ II removable rail section provide a well-equipped setup out of the box. It reflects Precision Reflex’s focus on thoughtful design, careful machining, and dependable craftsmanship.

Key Features:

• Manufacturer: Precision Reflex
• Model: MK12 Mod 0 SPR Gen III Upper
• Caliber: 5.56x45 NATO
• Condition: New
• Barrel Length: 18"
• Unique Features: Douglas 416 stainless steel barrel, Gen III carbon fiber free float forearm, full-length top rail with PEQ II removable section, Gas Buster charging handle with big latch, PRi flip up front gas block front sight and rear sight, brake and collar
• Threaded Barrel: Yes
• Weight: 6.460 lbs