Just using the factory plastic. You click in mag and think its in, but you can grab the rear and it literally moves up and down 1/4". Still stays in gun, but when rear drops it won't feed.
The first batch they made for magnums wouldn't feed at all. They redid them and mailed me two new ones. They don't lock in.
I've tried rear first, front first, both at same time, bolt open, bolt closed, standing on my head....don't lock.
