I use Hogue replacement grips on my 4506. I like them more than the factory grips...easier to take them off to clean the mag well and internals you cannot get to with the factory grips. I think that Uncle Mike's was making grips, but I am not sure.
BTW, anyone know of nay aftermarket grips for a 1076? Just picked one up yesterday, I have never seen aftermarkets for it as the frame is different (decocker).
Grapeshot, email me and I will see if we have any floating around the department that are spares.