Hello I have 2 bcm uppers with bcm bcgs in them and I was cleaning them both at the same time and forgot which bcm came with which upper. I know bcm test fires there bcgs before they send out the uppers. Does it matter which bcg I put back into which upper? They both are new uppers and have yet to be fired other than the test fire at bcm. Thanks.
It’ll be fine.
No, it doens’t matter.
you could swap them all day long and the only thing that matters is keeping track of approximate round count for maintenance
generally keep them with the same gun personally for the round count reason
you should have no issues
no, your good.
PB