NBS 11.5" Slick Side 5.56 Nitride-Carbine M-LOK Upper Assembly - 9533
Save 3% MSRP: $377.99$366.95
Out of 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
NBS — Our In-House Brand for Builders Who Demand Reliable Performance and Real Value.
Designed for builders who demand reliable performance and real value without unnecessary hype or inflated pricing. NBS stands for "No Bullshit."
Built on Strong Industry Partnerships
Through the strong partnerships AR15Discounts has built with trusted suppliers and vendors, we regularly gain access to premium components often manufactured by or for leading industry names. By purchasing these in volume, we bring them to you under the NBS label, ensuring proven quality reaches your build at a fair price, without the added cost of extensive marketing.
Quality You Can Trust
Every NBS product is specified to the exacting standards we apply to our own rifles. Each component features precision CNC machining, American-made key components where it counts, robust materials, dependable steels, and durable finishes engineered for long-term reliability. These items are either sourced from reputable OEMs or carefully assembled in-house using established name-brand elements, maintaining consistent excellence throughout the lineup.
Complete Solutions for Serious Builders
From stripped and complete uppers to bolt carrier groups, handguards, lower parts kits, and beyond, NBS provides a unified, affordable selection that allows you to complete confident, high-performing builds.
Backed by a Limited Lifetime Warranty
All NBS products come with our Limited Lifetime Warranty for the original owner, covering defects in materials and workmanship. AR15Discounts stands firmly behind these parts because, as shooters ourselves, we use and trust them, delivering honest value and gear you can rely on.
| Weight | 48 oz |
|---|---|
| Dimensions | 23.5 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | M4 |
| Cartridge Compatibility | 5.56 NATO |
| Barrel Length | 11.5 |
| Gas System Length | Carbine |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Not Included |
| MPN | 9533 |
| UPC | 999999533 |
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
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US
Is AR15 upper receiver
I recently went to the gun range and shot it and very happy with it
US5.56 Slick Side
Needed a good cleaning to get the grit out of the upper & some light oil after that cycling was smooth. No forward assist on this model. No problems with upper so for .
USNbs slick side 11.5 with m lock
Upper receiver is miss colored, does not match the fore grip. Slight purple/brown tint.
USHad to be returned...unsafe barrel obstruction
First off, the second you lay eyes on this upper, you get that it's cheaply made. The finish is thin and in several places on the barrel, there were tooling marks right down to the bare metal. This was for a budget Anderson complete lower so I was ready to be ok with it. Then I inspected the barrel and saw some sort of obstruction inside. No big, I thought, I'll just whip the bore brush through it and it will be good to go. No such luck. The blockage was large enough to keep the brass tip of the bore snake from passing through easily then once the bristles passed, the metallic, sharp obstruction was gouging the fabric of the rest of the snake. No luck removing it, had to be returned and I am glad I looked inside before putting rounds through it and potentially injuring myself or others. Spend the extra $150 and get a good upper such as Aero or Stag.
