So the stock front Kimber screw also works on the back...it just doesn't have the shank to fill the hole. You might be able to call Kimber and get them to send you one for not too much (ask me how I know ).It’s not going great but not poorly either. I can’t find a front one that looks like it’d fit flush, but that one is super light anyway. I got a titanium one from ti64.com for the rear screw. Though, it may be a hair short. I got a 7/8” long one, may have to try a 1”. Forgive dirty scale lol.
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Cheers!