18" Carbine 400 Legend Medium M-LOK Upper Assembly - 28377
In stock
18″ 400 Legend Medium Carbine M-LOK Upper Assembly
Hunt-ready performance with less recoil, more punch.
The 18″ 400 Legend M-LOK Upper Assembly is built for hunters who need straight-wall compliance without sacrificing power or precision. Featuring a nitride-treated 18″ barrel, medium profile, and carbine-length gas system, this upper delivers consistent sub-MOA performance with modern 400 Legend ballistics. It’s built on a mil-spec forged upper, with a steel nitrided gas block, American-made M-LOK handguard (style may vary), and nitrided A2 flash hider. Assembled with Permatex 242 and AEROSHELL 33MS for reliability in the field. BCG and charging handle not included. Backed by a Limited Lifetime Warranty.
Specifications
- Barrel Finish: Nitride / Melonite
- Barrel Profile: Medium
- Cartridge: 400 Legend
- Barrel Length: 18″
- Gas System: Carbine
- Twist Rate: 1:16
- BCG / Charging Handle: Not Included
- Handguard: American-Made M-LOK (style may vary)
- Muzzle Device: Nitrided A2 Flash Hider
- Origin: Made in the USA
Why 400 Legend?
The 400 Legend offers 25% more energy than the 350 Legend and similar energy to the 450 Bushmaster—while producing 20% less recoil. It’s the optimal solution for straight-wall states, delivering serious hunting power with enhanced control and shot placement.
| Weight | 85 oz |
|---|---|
| Dimensions | 20 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | Medium |
| Cartridge Compatibility | 400 Legend |
| Barrel Length | 18 |
| Gas System Length | Carbine |
| Twist Rate | 1:16 |
| BCG / Charging Handle | Not Included |
| MPN | 28377 |
| UPC | 28377 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
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