PTR 51P SBR FS – 7.62X51MM – FIXED STOCK SBR

The PTR 51P SBR FS – 7.62×51mm is a factory-configured short-barreled rifle engineered to deliver compact rifle-caliber performance with traditional PTR handling characteristics. Sold at the point of sale as an SBR with a fixed stock installed, this configuration emphasizes stability, durability, and familiar ergonomics in a reduced-length platform.

The rifle operates using PTR’s proven roller-delayed blowback system, providing a smooth recoil impulse and consistent cycling with full-power 7.62×51mm ammunition. A heat-treated, full-auto profile bolt carrier supports long-term durability and sustained reliability. The semi-automatic action is host-ready for use with NFA-registered auto sear packs where legally applicable. The overall finish consists of black powder coating over Parkerizing for corrosion resistance and wear protection.

The 8.5” stress-relieved, heavy-contour barrel features a 1:10” right-hand twist and is threaded 5/8×24, supporting common muzzle devices. A 6.9” steel Picatinny rail provides optic mounting capability while preserving the traditional polymer handguard configuration. This layout allows modern optics integration without altering the rifle’s classic appearance or balance.

Measuring approximately 31.5” in overall length and weighing 8.83 lbs unloaded, the 51P SBR FS feeds from 20-round aluminum magazines and features a trigger pull set between 9–10 lbs for consistent operation. Each rifle ships in a polymer case with foam padding and includes one magazine and a trigger cable lock.

Within the PTR lineup, the 51P SBR FS represents the fixed-stock, rifle-caliber SBR configuration—offering full-power performance, optic compatibility, and traditional handling in a compact, factory-built SBR platform.