Hello.
Are all AR15 bolt carriers the same and not caliber specific?
Natalee Answered question July 5, 2022
A bolt carrier group, or BCG, is a critical part of an AR-15 or other rifle. It is the “engine” that drives the weapon, loading, cocking, and firing the round. The BCG is caliber specific, meaning that different calibers require different BCGs. For example, a .223/5.56mm rifle will use a different BCG than a .308/7.62mm rifle. Bolt carrier groups can be made from different materials such as steel or aluminum, and can be finished in various ways including chrome plating or nickel boron coating.
Natalee Answered question July 5, 2022