Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Visit Ballistic Advantage for ordering information


  • Carrier Machined from 8620
  • .308 Bolt Machined from 9310
  • Forged Gas Key Properly Staked
  • S7 Tool Steel Extractor
  • Heavy Duty Extractor Spring and Viton O-Ring
  • Grade 8 hardware
  • Shot Peened Bolt
  • Forward Assist Serrations
  • Carrier, Gas Key, Cam Pin, Bolt, & Extractor coated inside and out with EXO NiB
  • Test Fired complete before shipping to ensure proper function

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

There are a couple simple reasons to utilize a Nickel Boron 308 AR Bolt Carrier Group in your 308AR and AR-10 rifles. The Nickel Boron Coating by FailZero is super slippery this means the bolt carrier group can operate with much less lubricant, the bolt carrier group will be easier to clean and the coating should allow the bolt carrier group to outlast the weapon under normal operating conditions. Less wear will also occur in the upper receiver. The finish also looks pretty slick.

The Aero Precision upgraded .308/7.62 Nickel Boron 308AR Bolt Carrier Group BCG is an eye catching addition to your AR build. Mil- spec dimensions and coating ensure the highest quality and correct component interface. Visit Aero Precision


  • Carrier is machined from 8620 steel
  • Nickel Boron coated
  • Bolt is machined from 9310 steel
  • MPI
  • Forward Assist serrations
  • Weight: 17.92oz

BCG Includes:

  • Bolt carrier
  • Complete bolt
  • Firing pin
  • Cam pin
  • Retaining pin


Weight 17.92oz

Platform 308AR DPMS

Nickel Boron coating by Fail Zero. Learn more about Fail Zero Nickel Boron Coating Services.

Drop-in bolt and carrier group has a self-lubricating surface that eliminates the need to apply oil or grease that can attract dirt, dust, unburned powder, and carbon and lead to cycling failures. Proprietary EXO-treated Nickel Boron finish produces an exceptionally hard surface that’s 40% more wear resistant than chrome plating, with an ultra-low friction coefficient. Surface is actually harder than the substrate underneath and will not peel, flake, gall, or rub off. EXO-treated Nickel Boron finish bolt/carrier groups have been tested to function reliably without additional lubrication up to 50,000 rounds. Reduced friction also means less heat generated by metal-on-metal contact, so the gun runs cooler and parts last longer. Easy to clean, too—fouling brushes right off. Before treatment, parts are shot peened for surface uniformity and magnetic particle inspected to make sure there are no hidden flaws. Gas key is hardened to USGI specs, chrome lined to resist erosion, and comes already staked to the carrier.

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

DPMS 308 Bolt Carrier

DPMS LR-308 Bolt Carrier Group

DPMS .308 bolt carrier parts list and image.

DPMS LR-308 Bolt Carrier Group


DPMS LR-308 Bolt Carrier Group Parts

Below is the parts needed to assemble a DPMS LR-308 Bolt Carrier Group. DPMS and part suppliers omit the 308 portion of the part numbers. Example : Bolt Carrier BT-12

  • 308-BT-16 – Firing Pin Retaining Ring
  • 308-BT-12 – Bolt Carrier
  • 308-BT-03 – Extractor Pin
  • 308_BT-17 – Cam Pin
  • 308-BT-02 – Bolt
  • 308-BT-14 – Firing Pin
  • BT-11 – Bolt Carrier Key
  • BT-10 – Bolt Carrier Key Screw
  • 308-BT-07 – Extractor
  • 308-BT-08 – Extractor with Extractor Spring

DPMS LR-308 Bolt

308AR Bolt Carriers

308AR Bolt Carriers

.308AR Bolt Carriers

This page only applies to standard gas operated .308 AR type rifles. Piston driven AR’s will be covered elsewhere.

Dimensionally Armalite and DPMS bolt carriers groups are nearly identical to within a few thousandth’s of an inch of each other. This means they are interchangeable. However the one thing to keep in mind is you cant interchange the bolts between the different brands of bolt carrier. This means only use an Armalite bolt in an Armalite bolt carrier and a DPMS bolt in a DPMS bolt carrier.


DPMS offers two variation. One with a standard mil spec finish and the other in hard chrome. DPMS also sells the individual components so you can build a bolt carrier group from the ground up. They also offer a hard chrome bolt that can be utilized with either of their bolt carrier offerings as well as the Fulton Armory and JP Rifles bolt carriers.


Fulton Armory

Fulton Armory offers two versions of their bolt carrier. The first is a standard DPMS LR-308 type and the second is a modified version that features a side cocking handle installed. The side cocking model is only to be used with an upper receiver milled to function with the side cocking handle. Using the side cocking model in a standard upper will damage you and your rifle.

Fulton Armory Bolt Carrier Group Fulton Armory Side Cocking Bolt Carrier Group

SI Defense

Not to much information on these bolt carriers other then they aren’t available for purchase yet as they are still in their testing phase at SI Defense.


To the best of my knowledge Armalite offers one mil spec bolt carrier group and from all reports its made very well.

ArmaLite AR-10 Complete Bolt Carrier Group

ArmaLite AR-10 Complete Bolt Carrier Group

JP Rifles

JP Rifles offers a mostly stripped bolt carrier. The JP LMOS Bolt Carrier and Key is a low mass bolt carrier finished in black QPQ hard coat. It increases longevity and lends a naturally smooth surface. This bolt carrier must be used with an LR-308 bolt assembly, firing pin, cam pin and firing pin retainer.

JP Enterprises LMOS Bolt Carrier and Key AR-10, DPMS LR-308