PRO2A 10.5" 12.7x42 (.50 Beowulf Compatible) Carbine Length Melonite M-LOK AR-15 Upper Kit

Product Description

The PRO2A 10.5" 12.7x42 Carbine Length AR-15 Complete Upper Kit delivers earth-shattering, big-bore power in an incredibly compact pistol profile. Fully chambered in 12.7x42mm (fully compatible with .50 Beowulf loads), this comprehensive assembly kit contains everything required to complete a premium big-bore pistol build except for your stripped lower receiver. Every kit features our professionally modified upper receiver, a heavy-duty Nitride Bolt Carrier Group, a complete Lower Parts Kit, and a stabilizing blade assembly to safely harness massive close-range stopping power.

Key Features

• Complete Assembly Package: Includes the upper receiver assembly, dedicated big-bore Bolt Carrier Group (BCG), lower parts kit (LPK), and stabilizing pistol blade buffer setup.
• Modified Big-Bore Upper Receiver: Precision machined with an enlarged ejection port to ensure consistent and absolute extraction of massive 12.7x42 brass casings.
• Premium QPQ Melonite Finish: The 4150 CMV steel barrel is treated inside and out for industry-leading corrosion protection, extreme heat resistance, and extended barrel life.
• Stabilizing Blade Assembly: Ships with a high-durability pistol stabilizing blade and matching buffer tube assembly to optimize ergonomic control and point-of-aim recovery.
• 100% Made in the USA: Built completely in-house with military-spec or superior materials, guaranteeing duty-ready engineering and reliability.

Technical Specifications

Why Choose the PRO2A 12.7x42 Pistol Kit?

Building a reliable big-bore AR-15 requires specialized engineering that off-the-shelf standard mil-spec assemblies fail to account for. Traditional right-handed receivers cause catastrophic stovepipe malfunctions and failure-to-extract errors because their small ejection ports cannot clear wide straight-walled brass. Pro2A Tactical resolves this engineering barrier directly at the bench. Our dedicated big-bore uppers are machined with an optimized ejection channel and paired seamlessly with a pre-headspaced, heavy-duty 9310 steel bolt face to guarantee consistent extraction strings. By anchoring an advanced, slick-surface 10.5" Melonite barrel to a matching lower hardware package and stabilizing blade brace, this master build kit delivers a balanced, cycle-tuned ecosystem. Avoid part-by-part manufacturer mismatching and assemble your duty-ready precision asset with ultimate confidence right out of the box.