I'm experiencing a few issues with my recently built SUR. First, out of 200 rounds I've had 3 failures to feed. Also, beginning this afternoon (fourth trip to the range), my bolt catch has begun failing to engage. My mags are magpul PMAGs, factory limited to 10 rounds, could this be my bolt-catch issue? I suppose the modified mags could be failing to engage the latch... I AM using cheapo wolf ammo. I know that this is frowned upon, but I thought it was just an extractor life issue, not anything that would turn up 200 rounds in. Could these two be related? I would be stoked if they were the same problem, otherwise I may have more problems on my hands than I am financially prepared to deal with.