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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.
| Upper Receiver | Milspec Forged 7075-T6 Aluminum, Optimized Straight-Wall Feeding Profile, Single Large Feed Ramp, Forward Assist & Dust Cover, Type III Hardcoat Anodized Black |
|---|---|
| Charging Handle | Standard Mil-Spec Charging Handle |
| Bolt Carrier Group | Milspec M16 Full Auto Profile, 400 Legend Specialized Face Configuration, QPQ Nitride/Melonite Treated, MPI Tested, 8620 Carrier with 9310 Steel Bolt |
| Barrel Length & Profile | 18-Inch Medium Contour |
| Caliber | 400 Legend (Winchester Straight-Wall) |
| Twist Rate | 1:16 Twist (Highly optimized for standard weight straight-wall hunting loads) |
| Barrel Material | 4150 Chrome Moly Vanadium Steel with QPQ Melonite Nitride Finish |
| Gas System | Carbine Length Direct Impingement with Low-Profile Gas Block |
| Handguard | 15-Inch Free Float Slim Profile M-LOK Handguard Rail System |
| Muzzle Device | Standard A2 Big Bore Flash Hider, 5/8x24 Thread Pitch |
| Lower Parts Kit | Complete 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 Assembly | M4 Carbine Adjustable Buttstock, 6-Position Mil-Spec Buffer Tube (Receiver Extension), Carbine Recoil Buffer, and Spring |
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.
| SKU | P2A400LGFS15CAR18-HT-KIT |
|---|---|
| Barrel Length | 18 inch |
| Rifle Caliber | 400 Legend |
| Manufacturer | Pro2A Tactical |