Ooh I was gonna ask about the SSA... do you have any trigger time on one?
About 2,500 rounds thru my LMT MRP with a Geissele SSA...I've shot Timney's/Springfields/Jp's...wouldn't trade my SSA for anything. It's really that good. And it's really the only combat worthy 2 stage out there, besides the KAC. Sure there are very nice other 2 stage triggers, but not as solid or reliable as the SSA. Type this in google: Geissele SSA site:m4carbine.net
then read all the various threads on it and what everyone thinks.