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148 Posts
Several threads concerning shrinking bolt gap issues, but I don't recall seeing anything regarding why it occures under normal conditions with a factory HK (the whole reason HK has different sized rollers). "My" assumption, and it is just that, is that bolt gap in a proper gun (good barrel to trunion fit and properly pinned) should never change due to movement between the barrel and trunion. I am of the impression that bolt gap should normally change due to wear and seating in the bolt head parts and rollers/and mating area in trunion. True or false?