The P320 X-Series Grip module assembly allows those with a P320 firing control unit to convert to a P320 X-Series Carry size, chambered in 9mm, .357 SIG, .40AUTO. There are multiple grip sizes to choose from to accommodate different hand sizes; including Small, Medium or Large modules. This provides optimal grip circumference and control access for any hand size. Requires the 9mm, .357 SIG and .40 auto slide and barrel. FeaturesFactory Sig Sauer partLightweight designCustomized for a variety of hand sizesMagazine release includedNote- This grip module DOES NOT include the extended magwell and internal weight.- The X-Series Grip Modules will not work with magazines that have "SIG SAUER" on the baseplate. They are compatible with the baseplates that have the SIG Mark on it.