Original post by: Sam Preston ,
Plunger Misalignment The plunger propels the bullets by air pressure. Often times after disassembly, the plunger can become misaligned with the holes in the barrel. Simply re-positioning the plunger so that its air flows directly into the barrel will solve the problem. Bad Seal in Plunger The plunger is made up of two tubes, one inside of the other. The outer tube is pulled back when the gun is cocked and forces air out the inner tube when the trigger is pulled. There is an rubber o-ring seal between the two tubes which forces the air to flow in the correct direction. If this seal fails, the air will not reach the bullet with enough pressure to fire. If this happens, the o-ring must be replaced. Home centers should have the appropriate size in the plumbing section, or a rubber band may be used as a substitute. See the [guide|34252|O-Ring Replacement Guide] for more details.