NBS 7.5" Slick Side Billet 300 BLK Nitride Pistol M-LOK Upper Assembly
Only 3 left in stock
An affordable pistol upper assembly without cutting corners. This means using a nitrided steel gas block from an American Manufacturer as opposed to aluminum and quality American Made handguards, paired with a 7.5″ Nitride treated barrel chambered in 300 AAC Blackout.
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 quality 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.
Lifetime Warranty
| Upper Receiver | NBS Slick Side Billet Upper – 6061 Aluminum – Pairs beautifully with any mil-spec lower – M4 Feedramps |
| Barrel | 7.5″ 300 BLK 1:7 Twist Pistol Length Nitride |
| Gas System | Pistol Length – NBS Nitrided Steel Gas Block – Stainless Steel Pistol Length Gas Tube |
| Handguard | 7″ NBS M-LOK Free Float Handguard – American Made – Extruded 6061 Aluminum |
| Muzzle Device | Mil-Spec A2 Birdcage w/ Black Nitride Finish |
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 | 35 oz |
|---|---|
| Dimensions | 19.5 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Cartridge Compatibility | 5.56 NATO |
| Barrel Length | 7.5 |
| Gas System Length | Pistol |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Not Included |
| UPC | 999993331 |
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
- clarification
- dust door
- Winchester
US
Super lightweight
Works great with 120gr Winchester super in magpul 556 mags and hexmag didn’t feed well with metal mag but overall good working upper super lightweight and no scratches, unlike photo mine came with dust door
USNice
Really good I would like to build another one
US300blk
Product and customer service was so helpful and great.
USAwesome
Great upper and fast shipping
USNice Upper!
Lifetime Warranty! You can't beat the deal and the quality. Love the upper. Perfect for my application.
