NBS 16" 5.56 SOCOM Quad Rail Complete Upper - 3683
In stock
We set out to make one of the most affordable complete uppers, without sacrificing the integrity of the complete upper, and most important the rifle. This upper features a 16″ NBS SOCOM barrel chambered in 5.56 NATO with a 1:7 twist and a midlength gas system. With the NBS line we wanted to make sure that we used quality products that wouldn’t break the bank. This means using a nitrided steel gas block from APOC Armory as opposed to aluminum and using quality internals like the NBS Black Nitride BCG paired with one of our classic NBS 16″ Midlength Barrels.
Made in the USA
Lifetime Warranty
| Upper Receiver | Anderson – 7075-T6 aluminum – M4 Feedramps – .250 takedown pin holes |
| Barrel | NBS 16″ 5.56 NATO SOCOM1:7 Twist Midlength Black Nitride – Guaranteed to hold a 1.000″ MOA at 100 yards with appropriate ammo and shooting techniques. |
| Bolt & Carrier Group | NBS Black Nitride M16 Bolt Carrier Group .223/5.56 – Full Auto Capable – 9310 MPI and HPT Tested bBolt – Case Hardened 8620 Carrier – 4130 Gas Key – Grade 8 Hardware With Proper Staking – Gas Key Sealed With Permatex No.3 – 8740 Hard Chrome Firing Pin |
| Charging Handle | Standard Charging Handle |
| Gas System | Midlength – APOC Armory Nitrided Steel Gas Block – Stainless Steel Midlength Gas Tube |
| Handguard | 12″ Free Float Quad Rail – Black |
| Muzzle Device | Mil-Spec A2 Birdcage |
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 | 64 oz |
|---|---|
| Dimensions | 28 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | Government / SOCOM |
| Cartridge Compatibility | 5.56 NATO |
| Barrel Length | 16" |
| Gas System Length | Midlength |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Included |
| MPN | 3683 |
| UPC | 999993683 |
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
USNBS 16" 5.56 SOCOM Quad Rail Complete Upper
Came complete and fired with no problems straight out of the box. Very pleased
United States
BCG sucks
I was super excited to try it out but the fit and finish kinda turned me off. The BCG ****** so bad. I got maybe 3 rounds off before a bunch of failures. the gas on it sucks. Genuinely unimpressed and will not be buying another upper. Can’t expect much from a no name. I should’ve went with a PSA for a budget AR
AR15Discounts.com
Hello! I’m really sorry to hear that your experience with our upper didn’t meet expectations. That’s definitely not what we want for our customers. The good news is that you’re backed by our lifetime warranty, so we’ve got you covered! We can either replace the item for you or we can bring it into our armory to take a look and fix any issues. Just let us know how you’d like to proceed, and we’ll make it right. We appreciate you giving us a shot and hope we can turn this around for you! Best, Michael Earnest
UShaving fit issues
I have not put any rounds through this yet. so i will update my review once i do. i am having some issues with this particular upper seating with my lower. there seams to be a little slop between the two. i know it is the upper as i have nested other uppers with this lower and they are nice and tight. i am not sure if i am going to try to mess with it or just return the set up.
AR15Discounts.com
Hello, I apologize for the, less-than-satisfactory, experience that you had with this item, as this should never happen. I want to make sure that you enjoy your order and you are satisfied with your build. If you would like, you can reach out to us at [email protected] and we would be more than happy to help you out. Please let me know if you have any other questions or concerns. Best, Michael Earnest
