Machine guns are useless. Maybe one bullet in ten hits brain, the rest just make ‘em twitch. Though, blowing out kneecaps does slow ‘em down. But your aimed rifle fire is far more effective.
I love my boys; good soldiers, every one. Professional. They didn’t move a muscle ‘til I told ‘em to. When we had to fall back, they didn’t leave anything behind, only went as far as I told ‘em, then turned and got back to killing zombies. They know this is as far as we fall back.
Ain’t nothing dead but still walking getting past this position.