Heavy Barrel was one of those fantastic kill
'em all 80s arcade games that didn't require a PhD to understand.
Essentially, you went around collecting gun pieces in order to
build the Heavy Barrel, which you could use to obliterate
everything in your path for a short time. For 25 cents, you could
play this game for a long, long time. The full size
version of this classic 80's video game rarely comes up. There are some
vintage versions available for the console (Sega, NES).