NBS 10.5" Carbine M4 M-LOK 5.56 NATO 1:7 Upper Assembly
In stock
A quality upper assembly without cutting corners. This means starting with a top tier mil-spec forged upper receiver, using a steel gas block as opposed to aluminum, quality American Made M-LOK handguards (handguard style may vary) and one of the nicest nitrided A2s you’ll find anywhere. This also means taking the time to ensure that the upper will function reliably. We use Permatex 242 on key components while using mil-spec AEROSHELL 33MS Anti-Seize grease on the properly torqued barrel nut and muzzle device.
Bottom line is this: you hear all the time about guys buying a budget upper and it not lasting or having to send it back because of some hardware defect or other issue caused by a careless assembly process. That is why we use top tier components and assemble each unit to the highest standard of quality. We want your upper to function flawlessly out of the box. In fact, we guarantee it will.
Buy with confidence, this upper is backed by our 30 day satisfaction guarantee. Buy it, run it, abuse it, and if you aren’t satisfied you can send it back for a full refund.
Lifetime Warranty
Made in the USA
Handguard style may vary from batch to batch
| Weight | 40 oz |
|---|---|
| Dimensions | 22.5 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | M4 |
| Gas System Length | Carbine |
| Barrel Length (inches) | 10.5 |
| Barrel Chamber | 5.56 NATO |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Not Included |
| UPC | 7819 |
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.
Customer Reviews
- Reviews
- Questions
US
Great upper and fantastic service!
This is my second NBS upper and thanks to the awesome folks at AR15 Discounts (led by the friendly shop manager Ryan) the initial hiccup I ran into was made right with the finest support around! AR15 Discounts is the best place on the web to build and equip your American rifle!
USPleasantly happy
Great looks and Can’t beat the price! Replaced the flash hider with a 3 prong and looks even better. Added this to my maxim pistol lower. Can’t wait to shoot it!
USSimple & Sure.
She shoots.
USSexy Handguard
As the title reads, this thing looks amazing. Railing is great, as well as the receiver. Would buy again if building a second pistol
USA+
It arrived quickly and has packaged well. this upper fit my lower perfect. my suppressor is close enough to the hand guard to look great but far enough to not worry about touching.
