What's up with the selector markings on these guns? I have seen pics of older 6920's with SAFE-SEMI and newer ones with SAFE-FIRE. I am in the process of buying a 6921 right now and was wondering if anyone has a new one and what it is marked. Also, on the roll marks, does the 6921 say COLT'S LAW ENFORCEMENT CARBINE like the 6920 or does it read M4LE COLT'S LAW ENFORCEMENT? Thanks.