NBS 10.5″ Slick Side Billet 5.56 Nitride Carbine M-LOK Upper Assembly - 25087
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
***Handguard style may vary by batch***
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 | 22.5 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | Government / SOCOM |
| Gas System Length | Carbine |
| Barrel Length | 10.5 |
| Cartridge Compatibility | 5.56 NATO |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Not Included |
| MPN | 25087 |
| UPC | 25087 |
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
United States
AR-15 Builder
Just wanted to say your company is amazing from your prices to quality products that you sell,A buddy told me about you prices WOW ! I'm going to be a Long Term costumer Thanks Brothers. Also your giving Midway USA Competition like to see like uppers 50 Boewulf also 8.6 Black out 22 WMR Magnum
Great upper for the price
Not sure why the other user had issues. My guess is operator error because this upper works perfect and look even better. There's really no need for a forward assist. I've never had to use one and it's not like I'm going to war with a $3-400 ar 15. One thing I really like is how where the receiver and handgaurd attach the contour of both match up. Making it look like one piece.
United StatesGreat upper for the price. Can't be beat!!!
Not sure why the other user had issues. My guess is operator error because this upper works perfect and look even better. There's really no need for a forward assist. I've never had to use one and it's not like I'm going to war with a $3-400 ar 15. One thing I really like is how where the receiver and handgaurd attach the contour of both match up. Making it look like one piece.
United StatesBolt lacks forward assist
I have had nothing but trouble with this upper. It has no forward assist. When I charged the weapon the bolt get stuck every time. I managed to get the round out once and thought it was just a operator malfunction and tried it again to no avail with the same result but this time the round won’t come out
AR15Discounts.com
Hey Michael, I'm very sorry to hear about your recent purchase with us. We don’t typically have this kind of issue with these, but we do have a 100% satisfaction guarantee, so we’d love to take care of this for you. Please reach out to our customer service team at [email protected]. We’ll make this right. -AR15-Discounts. E.T.
