NBS Lightweight .223/5.56 Bolt Carrier Group - Nickel Boron - 52051N
Out of stock
The NBS Lightweight 5.56/.223 Nickel Boron Bolt Carrier Group for the AR-15 platform is precision made to MIL-SPEC standards using the highest quality materials and machining available. By reducing the mass of the BCG, felt recoil is diminished, allowing you to stay on target for more accurate shooting. The NBS Lightweight BCG is perfect for competition/3-gun applications when paired with an adjustable gas block and a lighter buffer!
The carrier is made from 8620 tool steel and is paired with a 9310 steel bolt. The carrier and bolt are then treated with a nickel boron finish to ensure longevity, increase lubricity and make cleaning a breeze.
Features:
- AR-15/M4 BCG
- .223/5.56 NATO
- Nickel Boron finish
- Magnetic particle inspected
- 9310 steel bolt
- Case hardened 8620 tool steel heat treated carrier
- Properly staked gas key
- Grade 8 fasteners
- 4140 steel cam pin
- Shot peened tool steel extractor
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 | 8.96 oz |
|---|---|
| Bolt Material | 9310 Steel |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Finish | Nickel Boron |
| Carrier Profile | Lightweight |
| High Pressure Tested | HP Tested |
| Magnetic Particle Inspected | Magnetic Partical Inspected |
| Platform | AR-15 |
| Bolt Finish | Nickel Boron |
| MPN | 52051N |
| UPC | 999996109 |
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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- Works
- gas key
US
NBS Light Weight BCG
Purchased this BCG in the hopes of solving an Undergassed system. I am running an 18” name brand SPR barrel that was not fully cycling and activating LRBHO. After careful inspection of the entire gas system and several attempts to remedy the issue by replacing parts with either lighter buffer springs and lighter buffers, I learned the barrel came from the factory without an adequately sized gas port for a mid-length system. I decided to try one last correction and change of parts prior to having to either replace the barrel or have a qualified gunsmith open the gas port slightly. I ordered this BCG hoping it would live up to the reviews, and because it was priced less than many others. AR15 Discounts always ships fast and I’ve had nothing but exceptional service from them in the past. I have to admit I have a bit of a gun addiction and I’ve spent way too much money here in the past, but I’ve always found their prices competitive and the service phenomenal. When this product arrived, I noticed the finish was even and the quality was evident. The nickel boron coating is perfect. I am running a reduced power buffer spring and all aluminum weights in my buffer and with this BCG, my rifle now cycles perfect and I’m getting about 4 0’clock ejections. I’ve put about 400 rounds through the gun without one hiccup. If this BCG continues to perform like it has so far, I’d highly recommend it. Very happy customer.
USGreat BCG!
This BCG is perfect for my budget Coyote rifle build. Once I got the rifle tuned it’s been 100% reliable for me. The best part was that it was had at an incredibly low price. Liked it so much that I bought another. Highly recommend.
USWell worth the price.
Great fit and finish. Material quality and machining is very good for this price range. Looks great with the Nickel finish against the black upper receiver.
USGood price for a low mass bcg
Why pay an expensive name on bcg if Nbs exist which do tha same purpose
USQuality BCG
I’m very impressed with this lightweight BCG. I’ve had no issues with it so far and will likely purchase more in the future
