(Covers information from Anderson's universe)
Mostly Colt was a gun store in Raccoon City owned by Lance Halloran. Lloyd Jefferson Wayne, a survivor of the t-virus outbreak sought refuge in the shop from zombies and encountered Captain Henderson and several S.T.A.R.S. members.
It was riddled with bullets during Nemesis' attack on the S.T.A.R.S. members inside, and later vaporized along with the rest of Raccoon City by the nuclear missile.