carbine gas piston

[busterbrown]

piston broke on kahr m1 carbine.

anyone know how tight nut should be? is piston supposed to move? is a dedicated piston wrench required, or just a flat screwdriver?

appreciate the help

 

[georgeduz]

are taliking about the m1 carbine,the piston moves,use the round piston wrench.if it is broken send it back to the factory,