PTR 51P SBR FS – 7.62X51MM – FIXED STOCK SBR
$1,914.00
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The PTR 51P SBR FS is a semi-automatic 7.62×51mm short-barreled rifle configured with a factory-installed fixed stock, delivering full-power rifle performance in a compact SBR format. Sold as an SBR at the point of sale, it utilizes PTR’s roller-delayed blowback operating system to provide smooth recoil characteristics and reliable cycling in a reduced-length configuration.
Designed for users who prefer traditional handling and fixed-stock stability, the 51P SBR FS combines an 8.5” barrel, classic polymer furniture, and modern optic support. It occupies the fixed-stock rifle-caliber SBR role within the PTR lineup, prioritizing durability, balance, and consistent ergonomics.
- Product Description
Product Description
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.
- Product Specifications
Product Specifications
Caliber 7.62x51mm
Action Semi-automatic (Host ready for NFA-registered, auto sear pack)
Carrier Heat treated, full-auto bolt carrier
Overall Finish Powder coated over Parkerizing
Barrel 8.5" Stress relieved, heavy contour, threaded 5/8" x 24, twist 1 in 10" RH
Barrel Overall Length 8.39"
Optic Mount 6.9" Steel Picatinny rail
Handguard Traditional polymer
Trigger Pull 9-10 lbs.
Magazine 20 Round aluminum
Length 31.5"
Weight Unloaded 8.83 lbs.
Stock PTR Fixed Stock
Color Black
Case Polymer case with foam padding
Included Accessories 1 Magazine, trigger cable lock
Trigger Housing Indicator 2 Position
- Lifetime Warranty
All of our products are built to last. We proudly stand behind the quality of every product we manufacture and hope you’re happy with your gear. All products we manufacture are fully warranted against defects in materials and workmanship with a Limited Lifetime Warranty.


























