Cradle Airsoft is working right now on STANAG prototypes for the KJW, so there will be two kinds of mags available for the KJW. Personnally, I don't mind if there is no upgrade parts available for the KJW as it just doesn't need some. A cradle velocity reducer and piston kit and you're ready to go. Cradle will also release a bolt carrier anytime in the summer aside from the mags.
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