After the new Alloy AEG series from Valken Tactical, we're back to their HPA rifles that were released earlier, starting with the Valken V12 Optima BLOCK-II DST... "Each and every V-12 OPTIMA is individually hand built, tuned, and then thoroughly QC checked by our expert techs and R&D staff in Swedesboro, New Jersey to make sure each gun meets the highest of standards.