Quote:
Originally Posted by gm272gs
After shooting 50 rounds, my D.I. setup would have all kinds of crud in the upper receiver, along with some gritty crud in the lower receiver as well. The bolt and firing pin would both have built-up carbon, which would have to be scraped and brushed off. Now look at the parts after 160 rounds:
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Dont forget too. The piston bolt runs almost cold with very little heat built up.
