I am dying trying to figure out a game I used to play with my brother way, way back. All I can remember is it having a Army/GI Joe type theme + Horizontal scrolling + Keys or something similar + Rooms that had guns mounted in glass cases...allowing you to choose your weapon. The whole game has a very similar feel to heavy barrel. Im guessing this was released after heavy barrel...very late 80's to around 93-94...just a guess.
I think the coolest thing from the game was the rooms with glass cases and guns. That will probably stick out for those of you who have played it. Thanks in advance for the help.