Are bolt carrier groups caliber specific?

Bolt carrier groups (BCGs) are not caliber specific. They can be used with different caliber rifles as long as the BCG is compatible with the rifle’s action and the bolt head is of the correct diameter for the chamber. It’s important to note that416 Bolt Carrier Groups . We also offer adjustments to If you pressure test your complete upper receiver without a BCG installed and find it leaking, your root problem is more than likely your ejector port cover assembly o-ring. contaminationStop asking if a certain BCG will fit in yourAR15, everyone’s got an opinion but this seems to be The Truth™ Have you ever pulled back on a charging handle only to haveejector port cover fly out and go sailing across the room? Did you ever put an AR15 together only to find that your charging handle wouldn’t budge? Bolt carrier groups (BCGs) are the heart of any AR15 or AR10 type rifle or pistol. They ensure smooth and reliable cycling of your firearm’s action. Bolt carrier groups come in a variety of different finishes, calibers, and styles. With so many options available, it can be difficult to know which BCG is right for your firearm. Here is a quick guide to help you choose the best BCG for your AR15 or AR10 type rifle or pistol: Bolt Carrier Group (BCG) – Ammofire Editor’s Choice