Sig mpx k trade for maxim PDX in fde must be the 5.5 inch barrel. I have a ton of Accessories for the mpx but what goes with it will depend on what you have with the PDX. I have a 8 inch barrel and handguard for the mpx also. Plus a few brace/stock options and 7 mags. Pics show mpx in k configuration with collapsing brace. Of course optic and light not included unless agreed upon. Other than PDX I would trade for pvs14 or nice thermal setup like the flir breach or other helmet mountable options.