NBS AR-15 9310 Bolt Assembly - Black Nitride

Name: NBS AR-15 9310 Bolt Assembly - Black Nitride
Brand: NBS

NBS · Bolt Carrier Group

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Best price

$54.95at AR15Discounts

checked Oct 31, 2026

Buy at AR15Discounts

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Where to buy

Store	Price	Availability	Buy	Add to build
AR15Discounts Best price	$54.95checked Oct 31, 2026	Check store	Buy at AR15Discounts
Dirty Bird	$69.95checked Oct 31, 2026	Check store	Buy at Dirty Bird

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Dashed line = out of stock. Tracking since Oct 28, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
AR15Discounts	$54.95	$54.95	$54.95
Dirty Bird	$69.95	$69.95	$69.95

Since Oct 28, 2026.

About this part

The NBS AR-15 9310 Bolt Assembly - Black Nitride is a 5.56 / .223 bolt carrier group from NBS. It's sold by 2 stores, from $54.95 to $69.95.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups

Specifications

Manufacturer: NBS
Platform: AR-15
Caliber: 5.56 mm NATO
Finish: Nitride
Material: Steel

From the manufacturer

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 - Nitride QPQ Treated - MPI/9310 ENGRAVINGS WILL VARY BY BATCH