Does it seem like it is the body of the mag that is binding? If so, a little polishing or light lube might help out.
they shipped you an old holster? the guy in shipping/receiving department most had one too many tall boy over the break. call them or email them see if they will ship another for you free of charges.While on the topic of the 10rd magazines:
I received a holster 10mag and spre 8 mag from hipoint and the smell of cigarettes on those things is bad; but thats not the point.
I noticed that i have to push the magazine a little bit forward once its inserted to get it to "click" and be correctly seated in the gun.
Anyone else ran into that?