I guess I fall into the OP's main category as I took a new bone stock II and immediately added a new handrail, Eotech, compensator and cerakoted it tungsten. I wanted to customize mine so it looked a little different than the plain black version.

I've modded all my mustangs too so it must just be in my blood. I can't leave anything alone.

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Sport II Kimber UC2
SA XDM2