Feral Action Sports Technologies (FAST) F-1 Illustrator. The rear ASA has been removed, and the gas hole plugged. The bottom of the valve chamber was drilled and tapped for 1/8 inch NPT, and a vertical ASA and Sheridan RG-1 regulator was added. The gun also features a rear body plug drilled and tapped for a velocity adjuster, velocity adjustable (restricter type) bolt, Smart Parts barrel and 1-inch red dot sight.