Purchase the NBS 7.5″ 5.56 NATO Pistol Nitride M-LOK Pistol Kit w/ SIG Sauer ROMEO-MSR Green Dot here!

NBS 7.5″ Slick Side Billet 5.56 Nitride Pistol M-LOK Upper Assembly
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 5.56 NATO.
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″ 5.56 NATO 1:7 Twist Pistol Length Nitride Gas System Pistol Length
– APOC Armory Nitrided Steel Gas Block
– Stainless Steel Pistol Length Gas Tube Handguard M-LOK Free Float Handguard (style may vary due to availability)
– American Made
– Extruded 6061 Aluminum Muzzle Device Mil-Spec A2 Birdcage w/ Jet Black Nitride Finish SIG Sauer ROMEO-MSR Green Dot Sight – 2 MOA
Features:
2 MOA green dot sight Aluminum housing High performance coated lenses Unlimited eye relief Zero parallax Top mounted rotary knob 10 daylight brightness settings 2 night vision brightness settings Top mounted battery compartment – CR1632 20,000 hours of runtime IPX-7 waterproof and fog proof Includes lightweight absolute co-witness mount Includes see through lens covers BCA M16 Profile 5.56 NATO Complete Bolt Carrier Group – Black Nitride
Bolt Finish – Manganese Phosphate Bolt Material – 9310 Steel Caliber – 5.56 NATO (will also work with .223 and 300 BLK) Carrier Finish – Salt Bath Nitride Carrier Material – 9310 Steel Carrier Carrier Style – M16 Bolt Carrier Magnetic Particle Inspected Platform – AR-15 NBS Enhanced AR-15 Mil-Spec Charging Handle
OEM 5.56/.223 Lower Parts Kit includes:
Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch spring Buffer, Retainer, Buffer Retainer spring Disconnect, Disconnect spring Hammer (black or silver in color), Hammer Pin, Hammer spring Magazine Catch, Magazine Catch Button, Magazine Catch spring Pistol Grip (A2 style), Pistol Grip Lock Washer, Pistol Grip Screw, Pivot Pin, Pivot Pin Detent, Pivot Pin Detent spring Selector, Selector Detent, Selector Detent spring Takedown Pin, Takedown Pin Detent, Takedown Pin, Detent spring Trigger (black or silver in color), Trigger Guard, Trigger Guard Roll Pin, Trigger Pin, Trigger Spring
SB Tactical SBA3 Pistol Stabilizing Brace
Features:
Minimalist design 5-position adjustable Integral, ambidextrous QD sling socket ATF compliant, US veteran designed and proudly made in the USA Product includes: brace, adjustable nylon strap Discount Mil-Spec Carbine Receiver Extension / Buffer Kit

Take a look at our other AR-15 Parts here!