NBS AR-15 9310 Bolt Assembly - Black Nitride - 51015
In stock
Made from 9310 Steel which has a high core hardness and high fatigue strength unlike standard Hot/cold rolled 9310 steels. This is a Mil-Spec bolt assembly with enhanced features for those looking to complete a bolt carrier group. This bolt will make sure your gun outshines the competition
– Fully Assembled 5.56/.223 Caliber Bolt
– Shot Peened
– MPI (Magnetic Particle Inspected)
– HPT (High Pressure Tested)
– Power Spring Kit
–Â Nitride QPQ Treated
– MPI/9310 ENGRAVINGS WILL VARY BY BATCH
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 | 4 oz |
|---|---|
| MPN | 51015 |
| UPC | 999996290 |
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
excellent
It served perfectly
USCheap price and seems to work fine
200 rounds with it, it seems to work fine and be cheaper than the other options.
USCan't beat it.
Great bolt at a great price. I use it for a backup. Greased, wrapped in t-shirt cotton and sitting in my pistol grip. Better to have a spare bolt and not need it than to need one and not have it!
USGreat looking bolt assembly for the price
I haven't used it yet. But it looks like it's constructed well. And I like that it has a warranty
USNBS Bolt Assembly
I purchased this Bolt as a spare and wanted one that met all Mil-Spec dimensions. After checking a copy of the Colt drawings, I found it was totally within specs! In addition, the assembled parts were all correctly done. I can highly recommend this bolt!!!!!
