Posted: 10/13/2012 9:24:07 AM EDT
| BCM was the only place I could find a bolt carrier group, everyone else was out of stock. Great service got it within three days! This was my first build so im still learning alot about the AR platform. In the package with the bcg is a small rubber "O" ring, what is that for? |
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Quoted:
BCM was the only place I could find a bolt carrier group, everyone else was out of stock. Great service got it within three days! This was my first build so im still learning alot about the AR platform. In the package with the bcg is a small rubber "O" ring, what is that for? Extractor insert. |
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Quoted:
Found a youtube video on it. Is it necessary and what are the benefits of having it in there? Unless you have extraction issues, just leave it in the bag. 
It is necessary if it is needed, but depending on what you build, what ammo you use, whether you use a can, and if you do full auto work, it isn't a yes or no question. |