Product Description

The P2A HERO 7.5" 300 Blackout 1/5 or 1/7 Pistol Length Melonite M-LOK Rifle (SBR) is a professional-grade Short Barreled Rifle custom-engineered from the ground up to deliver maximum ballistic efficiency from the inherently short-barrel-optimized 300 AAC Blackout caliber. This legal NFA platform replaces generic short-barrel configurations with a meticulously optimized architecture that achieves complete powder burn, excellent terminal performance, and reliable cycling whether running heavy subsonic suppressor loads or high-velocity supersonic ammunition. Available with a selectable 1:5 ultra-fast twist or standard 1:7 twist barrel, the 7.5-inch medium-profile Melonite-treated 4150 Chrome Moly Vanadium barrel is paired with a pistol-length direct-impingement gas system to ensure proper timing, reduced backpressure when suppressed, and consistent extraction under varied conditions.

Built on matching billet 7075-T6 aluminum upper and lower receivers with Type III hardcoat anodizing, this HERO series SBR provides a rigid, lightweight foundation with M4 feed ramps, integrated trigger guard, and a free-float slim M-LOK handguard for maximum accessory flexibility. The true 6-position adjustable carbine stock eliminates the handling limitations of braced pistols while delivering stable shouldering for accurate shot placement. Finished to mil-spec or better standards and fully function-tested, this compact package is ideal for close-quarters, defensive, hunting, or recreational use where a stocked short-barreled rifle offers a decisive advantage over pistol configurations.

Key Features

• Selectable 1:5 or 1:7 Twist Rate: Choose the ultra-fast 1:5 twist for superior stabilization of heavy subsonic projectiles (ideal for suppressed use) or the versatile 1:7 twist for excellent performance with both subsonic and supersonic loads out of the 7.5-inch barrel.
• Optimized 300 Blackout Short-Barrel Platform: Chambered specifically for the caliber that thrives in compact lengths, delivering complete powder burn, high terminal energy, and reliable cycling where 5.56 NATO would suffer incomplete combustion and excessive blast.
• Pistol-Length Gas System: Properly timed pistol-length direct-impingement setup with low-profile gas block and stainless steel gas tube ensures reliable function, manageable recoil impulse, and reduced gas-to-face when running suppressed.
• Billet Upper and Lower Receivers: Precision-machined 7075-T6 billet aluminum upper (with forward assist and dust cover) and matching lower with integrated trigger guard, Type III hardcoat anodized for durability and corrosion resistance.
• Free-Float M-LOK Handguard: Slim-profile free-float M-LOK rail with continuous top Picatinny rail provides ample space for lights, lasers, hand stops, and optics without interfering with barrel harmonics.
• True Stocked SBR Configuration: Equipped with a rigid 6-position adjustable carbine stock, standard buffer tube, and matched buffer/spring for stable shouldering, improved control, and full legal NFA short-barreled rifle handling advantages over braced pistols.
• Premium Melonite Barrel Finish: 4150 Chrome Moly Vanadium steel barrel with Melonite (nitride) treatment for enhanced hardness, corrosion resistance, and longevity under high-round-count suppressed or unsuppressed use.
• Mil-Spec or Better Components: Includes properly staked gas key BCG (M16 profile, MPI tested), mil-spec lower parts kit, and crisp trigger group, all assembled and function-tested by Pro2A armorers for reliability and repeatability.