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The slide (pistol) will not cycle back to closed position

 
Problem
Possible cause
Solution
  The slide (pistol) will not cycle back to closed position. Magazine is too cold/amount of gas is inadequate. Wait until the pistol is at normal room temperature. Ensure magazine is full. Add silicon oil on nozzle rubber.
Oil in piston section has been used up. Wipe with silicon oil. If problem persists, it may be due to deterioration of O-ring replace→with new parts.
Loose breech block. Refit tightly
Cracked cylinder. Replace with new part(s).
Defective or malfunction of trigger. Check if the sear or spring is worn→if yes, replace with new parts.
Magazine BB feed outlet is damaged Replace with new parts and clean barrel feed chamber (where the BB's enter from magazine).
Abnormality of magazine feed outlet Wipe with oil. If problem still persists, immediately replace with new parts.
Lubrication of slide runner track not adequate Wipe oil on slide/frame track. If problem persists, replace or send for repair.
Piston o-ring is deformed or missing. If slide stops in the middle, there may be a piston o-ring blown into the cylinder. Remove and replace with new piston ring.
Slide stop catch is deformed. Replace with new part.

Last Updated: 15 Aug 2011 18:24:01