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16 inch 400 Legend AR-15 Upper Kit | Made in the USA

PRO2A 16" 400 Legend 1/16 Carbine Length Melonite M-LOK AR-15 Upper Kit

16 inch 400 Legend AR-15 Rifle | In Stock | USA Made

P2A PATRIOT 16" 400 Legend 1/16 Carbine Length Melonite M-LOK Rifle

PRO2A 18" 400 Legend 1/16 Carbine Length Melonite M-LOK AR-15 Upper Kit

Rating:
100 % of 100
Special Price $599.99 $769.99
Availability:
In stock
SKU
P2A400LGFS15CAR18-HT-KIT
PRO2A 18" 400 Legend 1/16 Carbine Length Melonite M-LOK AR-15 Upper Kit | Pro2A Tactical

PRO2A 18" 400 Legend 1/16 Carbine Length Melonite M-LOK AR-15 Upper Kit

Product Description

Maximize your medium-range knockdown power, terminal hard-hitting signature, and straight-wall compliance variables on standard AR-15 platforms without individual component matching guesswork. The PRO2A 18" 400 Legend Carbine Length Melonite M-LOK Upper Kit provides an all-inclusive rifle completion package engineered specifically to handle the structural feeding requirements and robust case expansion dynamics of Winchester's 400 Legend hunting cartridge. Constructed around a premium forged 7075-T6 aluminum receiver with specialized feed geometry tailored cleanly for thick, heavy straight-walled ammunition, this setup houses an 18-inch 4150 CMV medium profile barrel. The stable 1:16 twist rate maximizes downrange projectile stabilization, delivering immense kinetic force out to 200 yards. Operating on a tuned carbine-length direct impingement gas setup to produce smooth cyclic curves, this turn-key platform arrives completely paired with a heavy-duty, cartridge-matched bolt carrier group, full lower parts conversion kit, and an adjustable stock assembly. Drop these components into your standard stripped lower receiver to finish your ultimate straight-wall deer or hog tracking hunting rifle.

Key Features

  • High-Impact 400 Legend Caliber: Provides superior velocity scaling and terminal energy margins compared to legacy straight-wall choices, perfect for modern deer and hog hunting configurations.
  • Specialized Feed Profiling Receiver: Engineered specifically to cycle heavy straight-walled cartridge bodies cleanly and repeatedly without the feeding failures common in unoptimized setups.
  • Resilient Free-Float M-LOK Architecture: Premium 15-inch slim profile aluminum rail isolates the barrel from external handling pressure vectors, ensuring continuous point-of-impact accuracy.
  • Liquid Bath Nitride Protection: Full interior and exterior QPQ Melonite barrel coating provides maximum resistance to heat friction, extreme weather elements, and throat erosion.
  • Turn-Key Rifle Build Setup: No piecemeal component tracking required; arrives complete with a complete upper assembly, specialized bolt carrier group, full lower parts kit, fire control trigger group, and a standard adjustable rifle stock assembly.

Technical Specifications

Upper ReceiverMilspec Forged 7075-T6 Aluminum, Optimized Straight-Wall Feeding Profile, Single Large Feed Ramp, Forward Assist & Dust Cover, Type III Hardcoat Anodized Black
Charging HandleStandard Mil-Spec Charging Handle
Bolt Carrier GroupMilspec M16 Full Auto Profile, 400 Legend Specialized Face Configuration, QPQ Nitride/Melonite Treated, MPI Tested, 8620 Carrier with 9310 Steel Bolt
Barrel Length & Profile18-Inch Medium Contour
Caliber400 Legend (Winchester Straight-Wall)
Twist Rate1:16 Twist (Highly optimized for standard weight straight-wall hunting loads)
Barrel Material4150 Chrome Moly Vanadium Steel with QPQ Melonite Nitride Finish
Gas SystemCarbine Length Direct Impingement with Low-Profile Gas Block
Handguard15-Inch Free Float Slim Profile M-LOK Handguard Rail System
Muzzle DeviceStandard A2 Big Bore Flash Hider, 5/8x24 Thread Pitch
Lower Parts KitComplete AR-15 Lower Parts Kit (LPK) including Pivot/Takedown Pins, Bolt Catch, Magazine Catch, Springs, Detents, Standard Pistol Grip, and Mil-Spec Fire Control Group (Trigger & Hammer Assembly)
Stock AssemblyM4 Carbine Adjustable Buttstock, 6-Position Mil-Spec Buffer Tube (Receiver Extension), Carbine Recoil Buffer, and Spring

Why Choose This Product?

Hunting within strict straight-wall restricted zones often introduces feeding friction and cycling hesitation when running unoptimized standard AR setups. Pro2A Tactical eliminates these construction variables entirely. By pairing an expertly altered feed ramp receiver upper with a premium 18-inch Melonite barrel, a robust cartridge-matched bolt carrier group, and an all-inclusive rifle stock bundle in one cohesive package, you secure consistent sub-MOA groupings, uncompromising component integration, and professional reliability built right here in the USA.

More Information
SKU P2A400LGFS15CAR18-HT-KIT
Barrel Length 18 inch
Rifle Caliber 400 Legend
Manufacturer Pro2A Tactical
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