and in todays military how many M16s and M4s have the bolts switched back and forth
I can't speak of your military, but in ours when rifles were put into store each one had a position in the rack and there was a rack for bolts/breechblocks to match. When a rifle was issued out the rifle number and bolt number were checked off, and the two then handed to the soldier for them to confirm the two numbers matched (and check the CES) before putting the bolt into the rifle and signing the issue record.
