Maddog, you really don't need to change magazines that fast. Depress the catch with your right hand and remove the mag with your left.
The shooting schools sometimes give you drills that have very little real world value. The chance that you will shoot your 30 mag dry or near dry is a million to one. If you are unfortunate enough to have to ever reload your gun in a firefight, DO IT BEHIND COVER!!!!! The schools will have you standing up dumping a mag on the ground and reloading with a new one. In real life this will get you dead. You should be shooting behind cover or running to cover. And, if you are behind cover, you will have time to reload.
The shooting schools sometimes give you drills that have very little real world value. The chance that you will shoot your 30 mag dry or near dry is a million to one. If you are unfortunate enough to have to ever reload your gun in a firefight, DO IT BEHIND COVER!!!!! The schools will have you standing up dumping a mag on the ground and reloading with a new one. In real life this will get you dead. You should be shooting behind cover or running to cover. And, if you are behind cover, you will have time to reload.