GI vs. Standard
-GI: 1 sided thumb safety. Also the beaver tail curves towards the hand.
-Standard: Ambidextrous thumb safety. Also the beavertail curves away from the hand.
Single Stack vs. Double Stack
-A1 means single stack. For example: A1 GI 45ACP FS 1911 would hold 8 rounds.
-A2 means double stack. For Example: A2 TAC ULTRA 45ACP FS 1911 would hold 13 rounds.
