Took my new LCP to the range for the 1st time after a good cleaning and lube. It refused to chamber the 1st 2-3 rounds without rapping the back of the slide.I put 100 rounds through it with no change. The mag was also very hard to seat with 6 rounds even with an empty chamber. With 5 rounds, the mag seated fairly easy and the 1st round chambered fine. Ruger service is sending a new mag as that is what they think is the problem. Anyone else have this problem? Also, I have seen posts where people shorten the mag spring by one coil making the mag function. Any thoughts?