No ammo shortage for the DIY pneumatic gun builder. These home made air weapons range from basement target toys to ultra high pressure killers. I'll post pictures of mine tomorrow night after I finish some design tweaking. So far the power is impressive, my ammo is 3 inch decking nails. At 20 yards (and 100 psi) my little air gun blast the nails thru the side of a steel burn barrel, at 30 yards it lodges the nails to a white oak and I need a claw hammer to retrieve them, most the nails are bent from the impact. Quite deadly. I have several other test to do, including using it to shoot steel bearings, field arrows, crossbow bolts and fishing arrows.