Pro2A 5.5" 10mm Pistol Caliber Melonite M-LOK AR-10mm Upper Kit

PRO2A 5.5" 10mm 1/16 Pistol Caliber Melonite M-LOK Upper Kit

Description

The Pro2A Tactical 5.5-inch 10mm Auto Pistol Caliber Complete Upper Kit packages immense full-power performance into an ultra-compact conversion layout. Carefully hand-assembled and quality verified in Georgia, this package includes everything required to convert a standard stripped lower receiver into a functional personal defense weapon or wilderness companion. Paired with a heavy-weight blowback bolt carrier group and heavy buffer hardware to confidently absorb the high cyclic pressures of the 10mm cartridge, it eliminates compatibility guesswork for a truly streamlined build.

Key Features

All-In-One Transformation Package: Bundles a fully assembled micro upper group, matched nitride blowback BCG, standard charging handle, complete lower parts kit (LPK), and a full stock assembly.
Formidable 10mm Auto Energy: Delivers superior terminal ballistics compared to standard pistol calibers, packaging massive stopping power into an agile 5.5-inch setup.
Straight Blowback Simplicity: Engineered completely without gas blocks or gas tubes, dropping complex mechanical failure points to guarantee steady feeding and extraction cycles.
Premium Melonite Integrity: Treated inside and out with an ultra-hard Melonite finish, maximizing barrel bore life and defending against corrosive elements while offering effortless cleanings.

Technical Specifications

Upper Receiver	Milspec Billet Aluminum M4 Flat Top Receiver, Ejection Port Optimized for Pistol Calibers, Enhanced Feed Cone (Type III Hardcoat Anodized)
Barrel Length & Profile	5.5-Inch Medium Profile
Caliber	10mm Auto
Twist Rate	1:16 Twist
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Corrosion-Resistant Melonite Finish
Gas System Length	Not Needed - Straight Blowback Operation
Handguard	4 Inch Free Float Slim Profile M-LOK Rail System with Integrated Top Picatinny Rail
Muzzle Thread & Device	9/16x24 Thread Pitch with Standard A2 Flash Hider
Bolt Carrier Group & Handle	Complete 10mm Blowback Bolt Carrier Group (Nitride Processed / Glock Magazine Compatible). Standard Charging Handle
Lower Parts Kit	Complete AR-15 LPK with Pins, Springs, Detents, Grip, and Polished Mil-Spec Fire Control Group
Stock Assembly	Pistol Buffer Tube Assembly, Heavy 8oz PCC Buffer, Extra Power PCC Spring, Castle Nut, Endplate, and Adjustable High Density Polymer Blade

Why Choose This Product?

Transitioning into a hard-hitting 10mm pistol platform requires precise chamber engineering and extraction timing due to the increased pressures of straight blowback cycling. The Pro2A 5.5" 10mm Upper Kit addresses this challenge entirely by pairing an enhanced feed cone—optimized to smoothly route heavy hard-cast trail rounds and modern defensive hollow points alike—with a perfectly matched heavy buffer assembly. By combining all build components in a factory-headspaced package, it erases standard configuration troubleshooting. It is the ultimate turnkey choice for backcountry hikers and security-minded operators demanding serious short-range power.

More Information