Faxon 5.56 Gunner Lightweight Bolt Carrier Group, Nitrided

(10 reviews)
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When looking at lightweight bolt carrier groups, we were unsatisfied with what the market had to offer. Seeing a capability gap, we set out to create a bolt carrier group that could live up to the Gunner name with no compromise in strength or function. We set specifications that would allow no compromise:

  1. Lightest Weight Possible (8.5 Ounces Complete)
  2. MIL-SPEC Materials & Finishes or Better!
  3. Forward Assist Serrations
  4. Compatible with Dust Covers
  5. Maintains Full-Auto Trip Sear for full-auto and the new multi-stage trigger functionality

Matching our barrels, we selected Salt Bath Nitride for all the carriers components. By coating all parts, the carrier's natural slickness is increased markedly requiring less gas and pressure to operate. Further, the Nitride process seals components against corrosion while making them fantastically wear resistant. 

Improvements include using 9310 tool steel for the bolt, and nitriding the assembly to increase surface hardness, decrease resistance, and have superior corrosion resistance compared to typical chrome and phosphasted bolt carrier groups. All bolts are fully MPI tested to ensure the material is sound and without defects. Bolt lugs are chamfered 45 degrees to ensure reliable action for even the highest pressure hand loads and fast lightweight actions. 

Faxon Bolt Carrier Groups are Superfinished to reduce friction, increase smoothness of operation, and reduce fouling. Further, they are full-Auto rated and maintain the trip for full-auto fire control groups and new multi-stage trigger systems. Gas keys use grade 8 fasteners and are fully staked for a lifetime of service. 

As a testament of our confidence, the carriers are all laser-engraved with the Faxon Shield after passing all Quality inspections. 

Faxon recommends the use of an adjustable gas block with our Gunner lightweight BCG for proper function.

Detailed Specifications:

  • 9310 Tool Steel Bolt
  • Full MIL-SPEC Heat Treatment
  • Shot Peened to MIL-SPEC
  • Magnetic Particle Inspection (MPI)
  • Back of Lugs Chamfered for Reliability
  • Spring, Insert, & "Crane" O-Ring Installed
  • Salt Bath Nitrided Bolt & Carrier
  • S7 Extractor
  • Superfinished Carrier Body
  • Full Auto Compatible
  • Forward Assist Serrations




  • 5

    Posted by Red John on Mar 8th 2019

    This thing is sweet. By far the best BCG ive ever handled.

  • 5
    Light weight BCG

    Posted by CRAIG on Oct 10th 2018

    I bought this to try out in a new upper build and to offer my customers should there be interest and good results. I am very impressed not only with form but function. No feed issues, all rounds ejected properly and little if barley felt recoil

  • 5
    Faxon Light weight BCG

    Posted by Michael Reynolds Sr on Oct 6th 2018

    I have purchased several of these. There are lighter ones out there (aluminum, tiyanium) but these are made from steel, so I like them better. They will stand up to heavier use. Have never had any issues. They also have the serrations for a forward assist if needed. Wish they would just sell the carrier w/o bolt or add bolts for other calibers (6.8, 6.5 Grendel).

  • 5

    Posted by Ian Norris on Jun 12th 2018

    This was a great upgrade to my 3 gun rifle. After a few thousand rounds of with a cheaper lightweight bcg I started to have slam fires. I’ve run 14.5 and 16 inch gunner barrels in my rifle so I knew going with faxon I’d be getting a quality bcg. My rifle has been running flawlessly the last few matches. I’ve been very happy with all my purchases from Faxon.

  • 5
    Adams Arms 1st Class Peer

    Posted by Casey Reed on Nov 1st 2017

    Amazing quality. I have two light BCG evo Voodoo Adam's Arms high quality 5.56 rifles, and their bolts are an ounce heavier and are piston driven. This bolt is "worth it's weight " to use in a fine build. With a Faxon Barrel and upper receiver you can't go wrong. Very high quality product !

  • 5
    Very good finishing, performance

    Posted by Trevor on Dec 5th 2016

    I have the Faxon Gunner BCG in a precision AR build. The low mass of the BCG, combined with an adjustable gas system and suppressor, make recoil minimal. Its very easy to stay on target for rapid follow up shots. I have not experienced any sort of failure with this AR-15 so far. The BCG is very well designed and machined. Faxon has removed material in just about every imaginable area to save weight while maintaining function. The nitride coating makes cleaning very easy. I would definitely buy another one if I was assembling a new precision AR.

  • 5

    Posted by Justin/ 3 Gun on Nov 15th 2016

    Product Fit and Finish is excellent. The carrier is incredibly light and the Nitride treatment is consistent. Pair this BCG with an adjustable gas block and be amazed at the recoil mitigation. Faxon has great customer service and fast shipping. Would buy again.

  • 5
    My second one

    Posted by Marc / retired police officer on Oct 11th 2016

    I have this BCG in a light weight ar I built. I was not sure about using aluminum or Titanium. When my buddy told me about this one I jumped on it. My ar came in at exactly 5lbs. And I was happy about that. But was worried that my reliability would suffer or at least take a while to get dialed in. I have shot a few thousand rounds through it and from day one have had not a single issue. I ordered another one without any reservations. You won't regret it either.

  • 5
    what a great carrier.

    Posted by jamesvo on Sep 30th 2016

    These are some of the best BCG on the market. This runs on par (in terms of weight) as the titanium ones at half the cost. However, this is by no means a cheap (price wise) BCG. The fit and finish is top notch. All the machines parts are smooth without burrs. Nitride coating is even with no hot spots. I like the fact that faxon lists very specific details about their BCG such as the 9310 tool steel used on the bolt assembly. For those who don't know, that's the same material used in the gears of F1 race cars. I have this BCG paired with a JP silent capture spring system using the lightest spring (white). It cycles without a problem. I cannot speak for those who are using standard buffer tubes / springs. I advise anyone who is considering this to look into adjustable gas blocks to tune your gas system. I ran this BCG without an adjustable gas system on my 14.5" mid length but with the JP silent capture. No cycling issues at all. Who is this BCG for? 1. It's for those who are looking for ultralight parts to build an ultra light AR15. My 14.5" AR15 is at 4lb 11oz with a trijicon MRO. Yes. 2. Those who generally want top quality parts and money is not a concern. 3. Those who have too much money.