I bought 2 EAA polymer full size 9mms yesterday and upon inspection I noticed that with one of the guns, when having the slide closed the slide could move up and down in the frame. The other gun was tight just like it should be. I've had 4 Cz variants and all were tight like they should be. This one However is loose. What should I do? Send it to the manufacturer for repair? Anyone else ever had this happen? Any advice would be great.