I've seen this one:
(pic stolen from krelvin's post on this
thread)
at a gun show and I don't see how it could wear out a magazine. The bullets line up in a slot and when you push the mag in it uses the button to depress the follower while dropping 10 rounds in. Very slick, and very fast.
The only other loader I've seen is the little ring that you slip over the mag to press the button down easier. Saves the thumb, but you still have to drop them in one-at-a-time.

(pic stolen from krelvin's post on this
thread)
at a gun show and I don't see how it could wear out a magazine. The bullets line up in a slot and when you push the mag in it uses the button to depress the follower while dropping 10 rounds in. Very slick, and very fast.
The only other loader I've seen is the little ring that you slip over the mag to press the button down easier. Saves the thumb, but you still have to drop them in one-at-a-time.