This is the first upper in our line of NBS (No Bullshit) Upper Assemblies. We wanted to build an affordable upper assembly without cutting corners. This means using a nitrided steel gas block from an American Manufacturer as opposed to aluminum, quality American Made handguards and using a proven M16 profile Black Nitride BCG paired with a Bear Creek 16″ Mid-Length Barrel.
This also means taking the time to ensure that the upper will function reliably. We dimple every barrel and check for excessive leaks in the gas system using compressed air. We use Permatex 242 on key components while using mil-spec AEROSHELL 33MS Anti-Seize grease on the 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 brand name components, assemble each unit to the highest standard of quality, and why we don’t sell our uppers without pairing it with a BCG. We want your upper to function flawlessly out of the box. In fact, we guarantee it will.
NBS Slick Side Billet Upper Receiver
– M4 Feedramps
– .250 takedown pin holes
Bear Creek 16″ 5.56 NATO 1:7 Twist Mid-Length Parkerized
– Guaranteed to hold a 1.000″ MOA at 100 yards with appropriate ammo and shooting techniques.
Bolt & Carrier Group
Black Nitride or Nickel Boron M16 Bolt Carrier Group .223/5.56
– Full Auto Capable
– 9310 MPI and HPT Tested Bolt
– 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
APOC Armory Extended Latch
– APOC Armory Nitrided Steel Gas Block
– Stainless Steel Mid-Length Gas Tube
NBS 12″ or 15″ M-LOK Handguard
– American Made
Mil-Spec A2 Birdcage – Nitride