My FUMP. F1 Illustrator pump.
Had this lying around and it was missing several key components for a semi, but was prime for a pump.
Stock valve, with a modified valve stem. slotted the striker(from a F4) and body.
Carbine foregrip for a pump handle and autococker pump arms for guide and pump arm.
cut the feedneck down and trimmed the stock spring, added a velocity adjuster(from a F4) to bring the power down. it was 390 fps with the stock spring
CCM return spring and duct tape mod on the Armson for roll outs.