PDP Features video " Modularity" The PDP is the most modular and versatile pistol ever designed by Walther. With two distinctly different frame sizes and three different lengths of slides available you can truly tailor this pistol to be READY for your specific needs. Any slide length can fit on any frame, even if it is not a factory offering. If you are READY for a shorter dust cover with a longer slide or a shorter slide than dust cover it’s easy to configure. Any Slide fits on any Frame – if you want a shorter or longer dust cover we will have slides available for sale so people can do that. You must match the barrel length to the slide length, do not put a 4” barrel in a 5” slide... *The recoil system is the same on all models. *Sights are the same on all models. *Most parts are interchangeable from Compact to Full Size. (The backstraps are not.) *The Compact magazine will not work in the Full Size but the Full-Size will work in the Compact. Link to PDP: https://waltherarms.com/pdp/