The PTR 51P 7.62x51mm (brand part no. 51PBR-3080101) is a roller-delayed blowback pistol from PTR, built on the proven G3/HK91-pattern platform and configured with a collapsible brace rather than a shoulder stock. Its 8.5-inch threaded barrel keeps the package short and maneuverable while leaving room for a suppressor or other muzzle device, and the black powder-coat finish stands up to hard use. Feeding from HK91/G3-pattern magazines with 20+1 capacity on board, it is built for shooters who want the reliability of the roller-delayed system in a compact, brace-equipped format for home defense or range use. Note: PTR also sells a separate 51P SBR variant with a fixed shoulder stock, which is a distinct NFA short-barrel rifle; this specific 51PBR listing is the non-NFA pistol configuration.

Key Specifications

• Chambered in 7.62x51mm NATO, a full-power rifle cartridge in a compact, brace-equipped package.
• Wears an 8.5-inch barrel for a short, maneuverable overall length.
• The barrel is threaded, ready to accept a compatible suppressor or muzzle device.
• Runs on PTR’s roller-delayed blowback action, the same operating system found on the HK91/G3-pattern platform.
• Feeds from HK91/G3-pattern magazines holding 20+1 rounds, giving it broad magazine compatibility.
• Configured with a collapsible brace rather than a shoulder stock, keeping it a pistol, not an NFA item.
• Finished in black powder-coat, a durable, corrosion-resistant coating.

Frequently Asked Questions

Is this an NFA item? No, this 51PBR configuration ships with a collapsible arm brace, not a shoulder stock, so it is classified as a pistol and is not subject to NFA registration. PTR separately offers a fixed-stock 51P SBR variant, which is a distinct, NFA-regulated short-barrel rifle.

What magazines does it use? It feeds from HK91/G3-pattern magazines, with a 20+1 round capacity.

Is the barrel threaded? Yes, the 8.5-inch barrel is threaded for a compatible suppressor or other muzzle device.

Buy the PTR 51P Pistol

For shooters who want the proven roller-delayed platform in a short, brace-equipped pistol, the PTR 51P delivers 7.62x51mm NATO firepower in a compact package. Browse more of PTR’s semi-auto lineup and order this one from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.