PTR K3P SBR FS – 7.62X51MM – FIXED STOCK SBR

The PTR K3P SBR FS – 7.62×51mm is a factory-configured short-barreled rifle engineered to deliver compact rifle-caliber performance with fixed-stock stability. Sold at the point of sale as an SBR with a PTR fixed stock installed, this configuration emphasizes durability, controllability, and extended ballistic performance 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 reliability and sustained operation. 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 12.5″ stress-relieved, tapered-contour barrel features a 1:10″ right-hand twist and is threaded 5/8×24, supporting common muzzle devices. An extended mil-spec anodized aluminum M-LOK® handguard provides ample mounting space for modern accessories, while a 6.9″ steel Picatinny rail supports optic mounting without compromising balance or handling.

Measuring approximately 35.3″ in overall length and weighing 9 lbs unloaded, the K3P 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 K3P SBR FS occupies the fixed-stock, extended-barrel SBR segment—offering increased ballistic performance, modern mounting capability, and traditional stock geometry in a factory-built rifle-caliber SBR.