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Period-alterations are fine.
Non-period alterations, as long as they're historical, are fine (Nazis taking over Russian arsenals and putting new scopes on old surplus rifles).
Alterations made as repairs are fine.
It's only alterations that were never done to that gun and have no historical relevance that could cause them to lose C&R status. And it's not illegal to do...you can hack as many C&R rifles into as many configurations as you want. They'd just technically lose C&R status for future sales.
And I'm curious if the ATF has ever decided to go after anyone, ever, for a milsurp rifle he bought, tweaked to his liking, and later sold. I guess if you sell it down the road just reverse any non-historical, non-collector-y modifications you've made to be on the safe side.
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