ignore forces except gravity?

I have enemies that work great, but the problem is I want them to move downhill with gravity and bump up against eachother, so they cannot be kinematic, but if they are not, my bullets add a force to them and shoot them off spiraling into an abyss.

How do i make a game object affected by gravity, and affected by colliders, but ignore other forces

one way is change your bullet into a trigger, and just do the collision event on OnTriggerEnter() or OnTriggerStay(). This way the bullet will go through your enemies, but they will not be affected by it and you will still be able to detect collision.