New Turret: Recoiless Cannon
SE could use something to bridge the gap between rockets and bullets.
something with a faster velocity and lower accuracy to increase the chances of a hit beyond 400m on maneuvering targets.
I suggest a large grid only recoiless cannon between 40-90mm with cheap ammo, no splash damage, a clip of three rounds, and a fire rate around 3 rounds/s.
A Recoiless cannon can use the same base model as the other turrets, and would fit the art style of the game.