PSA Complete Rifle Lower Receiver A2. Just the thing for that A4 clone. True mil-spec style dark grey stock that darkens with application of CLP.Lower Machined from 7075-T6 Aluminum ForgingHardcoat Anodizing: MIL-A-8625F, Type III, Class 2Mil-spec style A2 stock with plastic latchRifle length buffer and springUn-notched Hammer compatible with 9mm useCaliber: MultiPSA AR15/PA10 Enhanced Polished Trigger: We start with our standard single-stage government-style fire control group, finely polish the contact surfaces and then coat the hammer and trigger in a super slick nickel finish. The result is a trigger that is substantially smoother than mil-spec. A great economical upgrade. Due to state laws, this item cannot ship to California.FFL Required