Post by Mark
John,
You are right, it is a confusing issue as there where many manufactures of modelguns and cartridges.
So, later I will try to make a list of the cartridges that I know of going by brand (Marushin and the like) and interchange ability.
With the typical modelgun being weak, it is good sense to at least use the cartridges that where ment for the particular modelgun as the use of an HW cartridge in a modelgun intended for CP cartridges is asking for breakages.