Yep, those 2 are Mk13 Mod 5 clones, the barrel taper is for the Mk11 silencer. The end of the barrel is polished because that's the part that the silencer fits over, it's easier to clean crap off a polished barrel. All of these rifles are military sniper clones built to exact specs. Except the XM3, that's an actual USMC XM3 my platoon had in Iraq (got it from the CMP). There's some interesting history behind some of them (such as the Mk15 Mod 1 being 1 of 3 that was built using original M88 overrun receivers, the CSR is from the original run made by XTSP for Remington, the PSR is a prototype, etc.), but it would take too long to post here. I added a list of the rifles to my original post, in case anyone is wondering what each one is.If it's a mk13 mod 5 build, it could be for the mk11 style suppressor
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