yeah it would be good to know that. but what i would do is put the 9 rounds it fits and let it sit in there for...i donno a week. some times your spring has to be broken in so it could just be alittle to tight... so hopefully if you leave it full for a while youll be able to shove another round in there.
Mandek357...i suggest doing what i mentioned. go ahead and leave nine rounds in it for about a week. or just fill it up and take the rounds out over and over so that the spring gets broken in. orrr you can push the spring down with a pencil and then put a screw driver through one of the holes so that i catches the spring from coming up.