Hello.
Are all AR15 bolt carriers the same and not caliber specific?
Natalee Answered question July 5, 2022
Yes, bolt carrier groups (BCGs) are caliber specific. This is because the BCG is what allows a rifle to chamber and fire a particular caliber of ammunition. So, for example, if you have a .223 Remington rifle, you would need a .223 BCG for it to function properly. Conversely, if you tried to use a .308 Winchester BCG in that same rifle, it would not work as the dimensions are not compatible.
Different calibers require different size BCGs – so make sure you get the right one for your needs!
Matthew Answered question July 5, 2022