The Essential Parts Kit for the O.Z-9 MBK includes all of the internal components necessary to assemble a complete O.Z-9 pistol with the purchase of an O.Z-9 MBK ZEV stripped slide ZEV trigger bar ZEV barrel ZEV guide rod and recoil spring ZEV sights ZEV O.Z-9 grip and ZEV O.Z-9 magwell. - Additionally the O.Z-9 MBK Essential Parts Kit includes a for Glock tool kit with a punch and front sight tool to facilitate assembly and maintenance of your pistol. - The O.Z-9 MBK parts kit includes the following components: - ZEV Slide Backplate - ZEV Skeletonized Striker - ZEV PRO Striker Spring - ZEV Firing Pin Safety - ZEV Firing Pin Safety Spring - ZEV Trigger Spring - for Glock Gen3 9mm Ejector Housing - for Glock Striker Sleeve - for Glock Spring Cups - for Glock Extractor Rod Bearing and Spring - Fix it Stick for Glock Tool Kit