The NBS Slick Side Billet Upper Receiver is a quality, American made billet upper featuring a unique design that sets it apart from traditional forged upper receivers. Manufactured to exacting standards on five axis CNC machines from a solid block of aircraft grade aluminum, this stripped upper not only looks good… it is built to last.
- M4 Feedramps
- Compatible with mil-spec forged lower receivers and most billet lower receivers
- .250 takedown / pivot pin holes
- No forward assist
- Designed to be used with or without a port door / dust cover (will need to remove c-clip from dust cover pin before assembly)
- Weight: 7.1oz
*Does not come with anti-rotation pin for use with NBS Free Float M-LOK Handguard and Dirty Bird Gen 2 Handguards. Anti-rotation pin can be found below:
98381A470 – NBS/Dirty Bird Gen 2 Handguard Anti-Rotation Pin – AR15Discounts
***UPPER MAY NOT BE COMPATIBLE WITH HANDGUARDS THAT FEATURE ANTI-ROTATION TABS.
Made in the USA
Backed by the NBS Limited Lifetime Warranty
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 | 0.0000 oz |
|---|---|
| Dimensions | 7.67 × 1.76 × 2.31 in |
| Color | Black, Burnt Bronze, FDE, Grey, Midnight Bronze, OD Green, Zombie Green |
| MPN | AR-15EBU, REV F |
| UPC | 3005-004, 3005-001, 3005-005, 3005-006, 3005-003, 3005-001, 3005-002 |
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
Billet Receiver
Honestly best bang for your buck. I just received it in the mail and I’m actually impressed, I wasn’t sure what to except but 5/5 on the rating.
USAr15 build
Good receiver and fit and finish is very good .
United StatesGreat quality
Great upper. No brass deflector warning. If your rifle is perfectly gassed, the brass will eject in the face of left handed shooters.
USSlick side billet upper
I got it on 1-5-2026 but it was missing some machining steps, Customer support email me a shipping label, Great service!!
USBest upper I’ve used in awhile
This slick side upper is really made well! Handguard mates up with no gaps. I lapped the receiver face like I always do and it was flat and perpendicular already. Price is good too. I’m very happy.
