Home AR-15 How the AR 15 Bolt Carrier Group Works

How the AR 15 Bolt Carrier Group Works

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Fun Gun Reviews Presents: “How the AR 15 Bolt Carrier Group Works”. This is No. 4 in the How to AR-15 Series. Demonstrating how the BCG interacts and locks with the barrel, How the Direct Impingement system relates to the BCG and details about how the charging handle functions.

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36 COMMENTS

  1. Besides the in-line buffer system, I think the rotating bolt (copied from the Johnson M1941) is probably the most ingenious part of the AR-15 design. Having seven different locking surfaces makes it EXTREMELY consistent and more accurate than most other semi-automatic rifles. Nobody expects their G3 or their FAL to be 1 MOA, but that's not unreasonable if it's an AR.

  2. That was a great review but I have a question. When the rear break down pin is pulled to remove the bolt carrier group and charging handle, is the bolt carrier supposed to come without releasing the charging handle? I have the CMMG conversion kit with the new charging handle as well as the bolt carrier and charging handle for the .223. They both fall out without releasing the charging handle. Thank you

  3. It sure does shit where it eats. Aerosol CLP sprays really come in handy. I put together a 450 Bushmaster AR-15 so I would have faster follow up shots on large game. The 450 BM is a straight-walled big bore cartridge therefore it can be used for hunting whitetail in over 30 states. If it weren't for Johnny Law I might have done a .458 Socom; but 450 BM brass is some tough stuff by comparison.

  4. I've done a lot of research on guns/mechanics…, but I can't recall why the bolt has to lock into the barrel. Is to keep the bolt forward, locked in place until the bullet leaves the barrel? Is it necessary, because of the gas tube?

  5. Recently purchased my first AR. I have watched a lot of videos, trying to understand the mechanics so I will know how best take care of my investment. This is the best video, by far. Thank you..

  6. how important would you say having a quality bcg in your rifle would be? I bought a nickle boron bcg instead of the original black nitrate. do you think it was unnecessary?

  7. Excellent explanation , but I still have one doubt. The gases in an impingement system enters inside the bolt to help unlock the bolt , but this eventually causes fouling. My question is if this is really necessary because on a piston system ar rifle, the bolt is unlocked only by the rearward action. In an impingement I would rather have the gases redirected to bleed to the exterior of the bolt and not foul the inside. I believe the piston system proves this is unneccesary. Wouldn't you agree?

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