PRO2A 16" 45 ACP 1/16 Pistol Caliber Melonite M-LOK Upper Kit
By Pro2A Tactical | Made in the USA
Hard-Hitting Large-Bore Power in a Carbine Footprint
The Pro2A Tactical 16" .45 ACP Pistol Caliber Upper Kit brings massive big-bore energy to the highly modular AR-15 platform. Engineered specifically to meet the heavy recoil demands of direct blowback operations, this complete kit centers around a premium 16-inch 4150 Chrome Moly Vanadium barrel. Its precision-rifled 1/14 or 1/16 twist rate delivers exceptional stabilization and accuracy for standard 230gr FMJ training ammo up to heavy subsonic defense rounds. The inner bore and outer surfaces receive a liquid-ferritic nitrocarburizing Melonite treatment, adding severe-duty wear limits and rust-proof resilience.
Built on an optimized pistol-caliber-specific upper receiver layout, this kit incorporates specialized geometry to ensure consistent, reliable feeding and extraction of straight-walled .45 caliber cartridges. Encased within a rigid free-float M-LOK handguard, it maintains clean barrel harmonics while offering tons of attachment flexibility for tactical upgrades.
Why Choose the PRO2A 16" 45 ACP Upper Kit?
Maximum Target Energy Delivery
The 16-inch barrel squeezes maximum muzzle velocity and striking energy out of the hard-hitting .45 ACP round, making it an incredibly potent option for home defense and close-quarters sport shooting.
PCC-Specific Feed Reliability
Unlike standard multi-caliber uppers, our AR-45 receivers feature an oversized ejection port and optimized internal contours specifically designed to handle wide, straight-walled .45 pistol ammunition smoothly.
Severe-Duty Melonite Armour
The complete high-temperature QPQ treatment structurally hardens the chamber area and micro-grooves, reducing surface friction for rapid blowback cycling and simplified maintenance.
Complete Drops-In System
This comprehensive kit includes everything required to complete your lower. Simply group it onto a standard lower receiver configured with dedicated .45 ACP magazine blocks or AR-45 lower layouts.
Technical Specifications
- Caliber: 45 ACP
- Barrel Length: 16 Inches
- Twist Rate: 1/16 Twist
- Operation: Direct Blowback Functionality
- Barrel Material: 4150 CMV Premium Steel
- Barrel Finish: Severe-Duty Melonite / QPQ Nitride
- Muzzle Thread: 5/8x24 TPI
- Upper Receiver: Hard Coat Anodized Black Billet Aluminum (Ejection Port Sized for PCCs)
- Handguard: 12 inch Slim-Profile Free Float M-LOK Rail System
- Muzzle Device: Standard (Enlarged to 45 Cal) A2 Flash Hider
- Bolt Carrier Group: 45 ACP Caliber, M16 Profile, Mil-Spec, MP Tested, Nitride Treated, 8620 Steel 2 Piece Carrier/Bolt
- Charging Handle: Standard AR-15 Charging Handle
- Lower Parts: Milspec Polished Trigger & Hammer, Standard Grip & Milspec Lower Parts Kit
- Stock: Standard Milspec M4 Stock with 6 position buffer tube, 8oz pistol caliber buffer, pcc buffer spring, latch plate and castle nut
Key Product Features
- Optimized 1/16 Twist: Engineered carefully to stabilize heavy grain weight defensive hollow points and standard ball targets alike.
- Competition Top Picatinny Alignment: The flawless top deck rail system allows rock-solid placement for red dots, scope mounts, or backup iron sights.
- Certified Armorer Quality Assurance: Built entirely in the USA and subjected to rigorous headspace checking and component inspection checks before shipping.
Comprehensive Lifetime Warranty
All Pro2A Tactical upper assemblies and kits include a comprehensive lifetime warranty covering manufacturer defects, guaranteeing severe-duty performance when it counts.
