The Turret is an enemy in LameDuke.
The Turret is machine with a long barrel. It does not move, but will stand in place and fire at the player. They cannot be destroyed.
The Turret doesn’t actually work. When the player approaches it, it will quickly and constantly play its fire animation, but nothing will come out of it. There doesn’t seem to be anything in the GAME.CON file that indicates what it should fire, either.
It's very likely that the Turret evolved into the final Turret, as they share many similarities. The only differences between the two are design and the incomplete nature of the LameDuke Turret.