Post by Mark
Yes, there are serious internal differences between the MGC and the Marushin cartridges that prohibit interchangeability with out some mods to the detonator etc.
The Wa-shan models seem to have some production differences like the plastic or zinc barrels etc. So, i am not too suprised that the Marushin or the MGC/KSC cartridges don't quite fit in it's barrel...
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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