Home CMMG Bolt Carrier Group A Beginners Guide to Understanding the BCG

Bolt Carrier Group A Beginners Guide to Understanding the BCG

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This video gives the basic explanation of what a BCG or Bolt carrier group is, explains the different parts, coatings and processes including Nib or Nickel Boron, Phosphate, Melonite and Chrome
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This video is intended for educational purposes only!

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22 COMMENTS

  1. You are calling the little pin in the face view an extractor, The little round pin when you look a the bolt face is the EJECTOR, The little leaver on the side of bolt is the EXTRACTOR. Learn your correct bolt parts before byoy make video.

  2. It sure looks nice and shiny…..you have to remember….The only contact points are on the rails. The rest is all looks. The working part is the bolt. Chrome lining is something u want. Specs on the BOLT is what you want to look at. Remember….contact points. That's where your wear is at. I chuckle when ppl over spend on overpriced stuff. (There is a diff in an ar15/m16 bcg, but in the back area close to the buffer tube)

  3. A semi-automatic bolt carrier group is called that because it can't engage with the auto-sear in a fully automatic lower receiver. It probably bears mentioning that a full auto bolt carrier does nothing to convert your rifle to automatic without a full auto lower receiver – it's just got more reciprocating mass which, theoretically, makes the rifle more reliable.

  4. Just wanted to add that the FAIL ZERO bolt carrier group is NOT "HPT" tested, as they feel that live-firing EVERY bolt carrier group is better then doing the simple "HPT" test that a lot of the other brands do. I like the fact that they test each and every BCG in an actual rifle before it leaves the factory, thus making sure the bolt functions properly and that it can withstand the pressures in a live-fire setting. Thanks for the great vids man, and keep up the great work!

  5. Stick to a well known, quality, proven name and there's nothing to worry about.
    Colt, BCM, LMT, Daniel Defense, Toolcraft, Microbest, all offer proper BCG's sold by proven AR manufacturers and supply our military.

  6. Good job on explaining a BCG.

    I still get a little confused on the type of steels especially when buying knives, and I assume that it might be the same with the materials of a BCG.

    I've found that with knives, companies come up with their own ratings and nomenclature of types of steels a knife that a knife is made of (it's all marketing) so there are no standards between companies. Is it the same with the steel that a BCG is made of? Saying the type of steel the BCG is made out of means nothing when there is no standard between companies. thanks

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