by vulrath » Mon Mar 29, 2010 6:03 pm
It sounds like JG based their design off of the Maruzen SR2, which also does not accept the Zero Trigger but takes most every other APS2 upgrade out there. The important parts are still upgradeable, so go for it. Clean out the inside of the cylinder, then replace the piston with a First Factory Tri-Element piston, the head with a Guarder APS2 head, and the spring with one of your choice. I don't know what kind of hop is in there right now, but I'd investigate putting a PDI hop chamber and an AEG barrel in there as well. you should be set then.