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I have seen many heavy use Sigs and there has been no cracking of the frame. I'm not saying it doesn't happen but I have twenty years of experience with Sigs being issued with hard use and no cracking. I do see Sigs that are not properly lubed, or lubed at all. Lack of lube and not replacing the rsa are the two biggest issues I see on a regular basis. You will beat up the guns when you fail to lube and replace springs.
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