Product Description

The P2A HERO 10.5" 400 Legend 1/16 Pistol Length Melonite M-LOK Rifle (SBR) is a premium, professional-grade Short Barreled Rifle engineered to deliver the knockdown power of the 400 Legend cartridge from a compact, maneuverable AR-15 platform. Developed to fill the gap between 350 Legend and 450 Bushmaster, it launches heavy 40-caliber bullets with noticeably more downrange energy than a .35-caliber round and markedly less recoil than a .45-caliber rifle — all from a standard AR-15 lower receiver. As part of Pro2A Tactical's elite HERO line, this build steps far beyond our value-driven Patriot series, replacing standard forged receivers with a precision-machined 7075-T6 BILLET upper and lower receiver set featuring a beefed-up upper profile, a flared magwell for lightning-fast reloads, and an enhanced integrated trigger guard for gloved-hand operation. At its heart lies a 10.5-inch medium profile 4150 Chrome Moly Vanadium barrel, Nitride/Melonite treated, with a versatile 1:16 twist &mdash and optimized to stabilize the full spectrum of 400 Legend loads. A pistol-length direct impingement gas system with a stainless steel gas tube and low-profile 4140 steel gas block delivers a strong, dependable cycling impulse, while a dedicated 400L bolt carrier group ensures positive extraction round after round. Wrapped in a 9.5-inch free-float M-LOK competition-top handguard and finished in durable Type III hardcoat anodized black, this SBR is built to dominate deer and hog hunting, mid-to-long range target work, suppressed shooting, and home defense alike.

Every HERO firearm is hand-assembled, inspected, and function-tested by our experienced armorers before it ships. From the exclusive Pro2A 3.5lb Milspec Curved Trigger to the PRO2A Milspec SOPMOD stock, every upgrade was selected to deliver a noticeably smoother, faster, and more confident shooting experience straight out of the box — no aftermarket parts hunting or gunsmithing required. Each rifle is 100% Made in the USA and backed by Pro2A Tactical's lifetime warranty and support.

Key Features

• Premium 7075-T6 Billet Receivers: Precision CNC-machined from solid 7075-T6 billet aluminum rather than forged, the HERO upper and lower deliver tighter tolerances, a beefed-up upper profile for added rigidity, a flared magwell for fast and fluid reloads, and an enhanced integrated trigger guard for superior comfort and glove clearance.
• Exclusive Pro2A 3.5lb Milspec Curved Trigger: A crisp, light 3.5lb pull with a clean break and short reset gives you a dramatic accuracy and speed advantage over gritty standard milspec triggers, while retaining milspec reliability and drop-in fitment.
• Superior Knock Down Performance: Provides superior velocity scaling and terminal energy margins compared to legacy straight-wall choices, perfect for modern deer and hog hunting configurations.
• 10.5" Melonite Barrel with Versatile 1:16 Twist: Medium profile 4150 CMV steel with Nitride/Melonite treatment provides exceptional hardness, corrosion resistance, and barrel life, while the 1:16 twist reliably stabilizes the popular match and hunting bullets in this caliber.
• Dedicated 400 Legend BCG: Full Auto M16 profile 8620 carrier and 9310 bolt with the correct 400L face, nitride treatment, properly staked gas key, and MP testing for unmatched durability and reliable extraction.
• Pistol-Length DI Gas System: Stainless steel gas tube paired with a low-profile 4140 steel gas block delivers a strong, consistent cycling impulse from the 10.5" barrel and a clean, low-profile look under the rail.
• 9.5" Free-Float M-LOK Handguard: A 6061-T6 aluminum competition-top free-float rail provides a rock-solid optic platform and abundant M-LOK real estate for lights, lasers, bipods, and grips without affecting barrel harmonics.

Why Choose This Product?

The P2A HERO 10.5" 400 Legend SBR answers the question every serious AR owner eventually asks: how do you get true short-medium range performance but with enough knock down power? The 400 Legend was designed for exactly that mission, and the HERO gives it a platform worthy of the cartridge. Its 10.5-inch 4150 CMV Melonite barrel retains a surprising amount of velocity while the 1:16 twist keeps high-BC bullets stable and accurate, and the dedicated bolt carrier group keeps the gun feeding and extracting reliably. Add a quality optic and you have a handy, hard-hitting package that excels at deer and hog hunting, steel out to extended range, and confident home defense — all with recoil that stays soft and controllable.

Unlike forged-receiver builds, the HERO's 7075-T6 billet upper and lower are precision-machined for tighter fit, enhanced rigidity, and a distinctive premium aesthetic. The flared magwell speeds reloads under pressure, the integrated trigger guard improves comfort, and the exclusive Pro2A 3.5lb Milspec Curved Trigger delivers a crisp, light pull that dramatically improves practical accuracy at distance. As a true NFA Short Barreled Rifle, it pairs these upgrades with a PRO2A Milspec SOPMOD stock for stable shoulder-fired control that braced pistols simply cannot match. Backed by a nitride-treated, MP-tested BCG, a 7-inch free-float M-LOK rail, and a lifetime warranty, it is a no-compromise compact precision tool ready for the field, the range, or the home.

Partnering with some of the best manufacturers in the industry, we bring you our premium line of rifles and pistols, the “HERO”. Taking everything our customers love about the Patriot line and elevating it further, every HERO firearm features billet receivers, upgraded triggers, and premium furniture, carefully built and assembled by our team of experienced armorers who know the importance of reliability and repeatability. Every component is manufactured to milspec or better standards to ensure an exceptional firearm is produced. Whether it is for sporting, hunting, or defensive needs, the HERO line is ready to rise to any occasion. Because sometimes all you need is a Hero.