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I didn't see this brought up regarding the running of s/n, but what if someone (me and probable several others on here) has a Glock/Sig/HK, etc that originally came in .357SIG and a barrel swap took it to .40. Now the frame and the slide has a matching s/n, but the barrel has a different s/n(at least in the case of a Glock). I know it's 100% legal from a Fed standpoint but has it ever raised red flags with the DPS or other agencies on a road side stop or are they aware of the ability of barrel swaps and the different s/n that may be present. I drive on toll roads a lot and want to be prepared if/when I get stopped by DPS, or really any agency for that matter.

Thanks.