NBS 7.5" Slick Side Billet 300 BLK Nitride Pistol M-LOK Upper Assembly
Only 5 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 |
| 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
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- Twist
- hexmag
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- Winchester
- lifetime warranty
- photo
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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.
