BCG AR15

[02roadster]

How or when should the BCG be replace on an AR type, 5.56? Mine is starting to show some signs of wear.

 

[Mgderf]

I can't imagine needing to change one out in less than 5-6k rounds, maybe longer.

 

[NyleRN]

When the bolt has a visible crack or one of the lugs break off. The carrier should never need replacing

 

[JAL]

Chad in School of the American Rifle has numerous BCG inspection videos . . .

https://www.youtube.com/@InstructorChad

His latest BCG inspection is this one. While most of us wouldn't have the gauges he has, his inspection videos give you a very good idea of the kinds of things to look for and evaluate when inspecting one based on appearance including what to look for and the signs of wear. If you search his videos for "BCG" you'll find he has made many of them.

Some of his better ones


The worst he ever captured on video

 

[02roadster]

Many thanks!!!

 

[02roadster]

When the bolt has a visible crack or one of the lugs break off. The carrier should never need replacing

Thanks a bunch!

 

[02roadster]

Chad in School of the American Rifle has numerous BCG inspection videos . . .

https://www.youtube.com/@InstructorChad

His latest BCG inspection is this one. While most of us wouldn't have the gauges he has, his inspection videos give you a very good idea of the kinds of things to look for and evaluate when inspecting one based on appearance including what to look for and the signs of wear. If you search his videos for "BCG" you'll find he has made many of them.

Some of his better ones


The worst he ever captured on video

Will check this out, thank you!

 

[BigMoose]

A new set of gas rings never hurt.

 

[DadSmith]

How or when should the BCG be replace on an AR type, 5.56? Mine is starting to show some signs of wear.

Wear is fine. The carrier itself should last a very long time just keep it well maintained/lubed.
The bolt you may have to replace. However, a good bolt will last a long time as well as long as you do proper maintenance on it.
Replace gas rings, extractor, and ejector as needed, keep extras on hand to do so.

I tried to find a picture of cracks on bolt lugs but my Google fu failed.