Originally Posted by Rastoff

I have both a .45 and a .40, but never thought about the back plate. Give me a few minutes and I'll swap them and see if they fit. Stand by...


OK, it is now 10 minutes later and I have swapped the End Caps. Both guns function properly and the End Caps fit perfectly. I believe it's safe to assume it is the same part for all three calibers of full and compact sized guns. The Shield is still a different animal.