You're at the shooting range, practicing your accuracy with the M4 since you weren't exactly used to it.

You do the classical shooting two bullets into the chest of the paper target and one at the head

You empty your mag and the muscle memory kicks in. You grab the new magazine, smacking the empty one to the floor. You reach your hand under the gun and pause when you miss the bolt.

There is no bolt...

"What the fuck!?" Ghost said shocked