Re: Williams BM vs. PTG Bottom Metal
I have one of each, and I would say the Williams is better <span style="font-style: italic">finished</span>. The gap on the lever in the trigger bow is tighter, and it is evident more work was done in final assembly blending the various radii and such.
However, the PTG is by no means ugly or less robust. TBH, if you're gonna blast and coat the guard, the greater clearance in the PTG would probably be preferable.
I'd say both are equally strong, and I'm satisfied with them both.