I bought two magazine when I purchased my Cooper.One feeds perfectly,the other was replaced under warranty because it didn't like to feed the last round on occasion.The replacement magazine feeds perfectly,as long as I don't try to shoot CCI standard velocity ammunition in it.It takes much more effort to close the bolt with those loads,and accuracy isn't great either.I just received my order of 5000 SK Standard Plus loads,so I am good to go for a while.
