Not even going to start on "tactical". We already covered this in another thread. LOL! I've always thought that using M4 just indicated that it's a light weight carbine design in the civilian market. As for "tack driver", it's an old school slang to indicate a weapon that is very accurate. Of course "accurate" is a relative term, but it originated to describe a rifle that was accurate enough to drive a nail into a board at a given range consistently. It should actually be "Tac-Driver". To me if someone describes a weapon as a tac-driver I expect it to be sub MOA.
I felt that you were talking about me lol "Combat Readiness" lol