Post by Mark
You might email francky1958 to see if he can locate the manual or something for you. It sounds to me that something is either broken or mis-placed inside of the action. Good luck!
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Wanted to buy: MGC Sten MK3....trades?(still)
MGC MP40 Marushin MP40 Nakata MP40 TRC MP40
Modelgun manufacturers, past and present:CMC,CAW,Hudson,HWS,LS,MGC(R.I.P. 1960's~2007) Marushin,Marui,Kokusai,Shoei,Tanaka and Western Arms