GP100 evolution and interchange?

[Hizzie]

I believe just about everything is compatible between new and old GPs.

Some of the new ones come with "compact" grips that as I understand it are simply SP101 grips but they should take regular size GP grips as well. I think there's a difference in some of the sight cuts as well but those are more sub-model dependent than a generational issue.

Nope. The GP100 and SP101 Lett grip are NOT interchangeable. The side inserts for the Compact Lett (GP100) and SP101 are the same size. However the insert needs to be relieved for the locator pin.

[awp_101]

Thanks @Hizzie! I haven’t had a Lett gripped GP in hand so I misunderstood the relationship.