Hi Dan and welcome. The pro E has a polymer trigger shoe, and base pads. No threaded barrel. The PDP Pro SD guns, which all include the premium Dynamic Performance Trigger, magazine wells and threaded barrels. Pro E features listed here: shootingillustrated.com/content/first-look-walther-pdp-pro-e-pistols/ ---------- Cheers and stay safe!

pro e non threaded barrel the pro sd is threaded different trigger shoe pro e is flat face sd is curved here is a good review that talks about some of the differences pewpewtactical.com/new-product-highlight-walther-pdp-pro-e/