Add a golem turret.

I propose creating a golem that fires the specific projectiles it is carrying.

In other words, it would have an inventory (like a horse) and fire whatever projectiles are stored inside.

Ideally, it would be two blocks tall and resemble a dispenser or dropper.

However, its unique feature would be the ability to be supplied via a hopper. Also, if placed in a minecart, it would fire while riding in it.

It would function similarly to a dog by bonding to the player; if someone hits the player, the golem would attack the aggressor in return.