Contribute to the economic recovery.
I also have an upper from a company i am not going to mention here that has a carrier key that looks like it was staked by a kinder gardener. I am not going to spend another dollar on it until it breaks and that could be a long, long time.... It is not my primary self defense zombie killer rifle though.
spare - need the whole BCG, or just the bolt?
I've got a BCM upper and BCG. I'd like to have a spare bolt that I could just drop in if I had any problems. Can I get a spare BCM bolt (just the bolt,without the carrier) and expect that to function if I dropped it into the existing BCG?
For classes and matches and whatnot, seems like it would be easier to just swap the bolt in case I have an extractor break or something like that.