Too f'ing small sometimes, had a short but uncomfortable time on the ranges once when we couldn't account for one. Someone had put an ammo container down on top of it.
I suspect not as uncomfortable as the bloke I saw shoot his own finger* with one, having accidentally put it over the front guard.
*He just nicked the edge of it. No permanent harm done but it was very funny watching him try to keep shooting while pissing blood from his hand.