So i went to the range today, chambered a round, pulled the trigger, and click. I tried this several times and coulldnt get it to fire. So I pulled the BCG out, stripped it and cleaned it. I put it back together and got through one mag. When i put the new mag in....click no bang. This is a fairly new gun, only a few hundred rounds through it and this is the first time ive had an issue. what do i need to look at.