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I was going to give a similar answer, but they beat me to it. Unless it has been taken apart and cleaned to the T, you can tell.
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you can see the effects on the target and your movement over the piston.
yes u can tell if a gun has been fired things to look for...residue/fouling in the barrel, powder on the breachface, scraping on the ejector, striations on the mag follower,
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