As my TM hi capa experience, remove the slide and disassemble the nozzle parts see what the problems causing it sticky. Look for any broken or crack or even damage o-ring. Also any rubbing area or worn out you can see after clean up the excessive oil or grease.
My problem was the top of the nozzle rubbing the inside slide and caused the nozzle got stuck and bb's rolled out once in a while. By filed the housing of the slide to fix it. Hope it helps.
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aka Uncle
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