Standard Output 800 psi regulated air tank 3000 psi max input PSI/13CI. Tank has Foster type male fill and Tank pressure gauge. $15 extra for 1000 PSI. $35 more for 1200 or higher PSI Output. LD MKI pistols should not be run past 1000 PSI on HPA. All the Reg pistons get upgraded to 90 durometer Mil Spec orings to extend service intervals & get the Mac 1 Magna-Cap inlet Dust cover. Made in USA. Upgraded, pressure tested & reg tested By Mac1.