Home CMMG Ep-7: How Does the AR-15 Bolt Carrier Group Work? Which One Do...

Ep-7: How Does the AR-15 Bolt Carrier Group Work? Which One Do You Need?

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AR-15 Bolt Carrier Groups are the most complicated part of your rifle, but getting the right one doesn’t have to be. Today we help explain HOW your bolt carrier group works and the dozen components that get the job done! There are a TON of BCG manufacturers like Aero Precision, Lantac, Faxon & more….and a TON of BCG options like enhanced Bolt carrier groups, competition BCGs, DLC coatings, titanium nitride coatings, & the list goes on. Let’s drill the list down to what BCG matters to you!

00:00 – Intro
00:26 – AR-15 Bolt Carrier Group
01:17 – How Do BCGs Work?
02:38 – BCG Anatomy
02:56 – Bolt Carrier
04:03 – Gas Key
04:59 – Firing Pin
05:43 – Firing Pin Retaining Pin
06:13 – Cam Pin
07:22 – Bolt
10:04 – MilSpec Standard?
10:22 – Enhanced BCGs
10:42 – Competition BCGs
11:01 – Adjustable BCGs
12:38 – AR-15 Lower Receiver Breakdown

We strive to provide the growing AR-15 shooting community with helpful, fact-driven information about the AR-15 & AR-15 style firearms and accessories to do our part in bolstering a more well-informed community and safer when handling, building or shooting their personal firearm. Let’s face it, we all have to start somewhere when it comes to becoming a firearms expert. Our goal is to help you get there one small step at a time.
**The purpose and content of this video is to provide general information regarding the products and their applications on any/all related firearms that strictly comply with all federal, Minnesota state, and local laws. The viewer expressly agrees that AT3 Tactical LLC; its officers, directors, employees and agents shall not be liable for any damages or losses related to the products and information provided in this video and hereby agrees to hold the foregoing harmless from any such losses or damages.

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27 COMMENTS

  5. Because the ar15 is chambered for 556/223 the barrel is milled accordingly. How accurate can a 9mm or 22lr round be just because the bolt is changed for that round? with all the tolerances being as they are its hard to fathom the round not jumping around going down the bigger bore barrel? Did I make any sense?

  13. I prefer Cryptek Mystic Black CVD coated bcg's because they are much easier to clean, nothing sticks to them, nothing is more wear resistant and nothing is slicker. I also like there precise machining tolerances they keep as close as we do in the benchrest world. 2nd choice is Iron City Rifle Works Black Diamond bcg

  16. Nickel boron is a terrible coating, mil spec is hard to beat and can hold oil better than most of the newer finishes..Chrome plated carriers are excellent if done correctly..It is more important if the bolt and carrier is machined correctly with the proper 3 bore dimensions and length..

  19. I just found this channel and as I started this video I was putting some things away and I recognized this voice. I said to myself, “That sounds like Randy from BRS.” Low and behold, it’s Randy! Awesome how the interests cross over. Glad to see you over here Randy!

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