Post by Mark
Yep,They are interchangeable.
All of the currently available caps are made by the same manufacturer. They are mostly different due to their packaging. Others like the Marushin caps have metals/chemicals in their formulation to make them spark when they are fired. I personally prefer the MGC caps as they don't spark..
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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