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Nothing really. Legend is that they are all assembled in Taiwan from Japanese made parts, some are sent to retailers right away, a few batches of them are sent to Japan for a final QC inspection, stamped with JASG on the underside of the front end in the rail slot, then sent to retailers.
Aside from that, they are the exact same gun, in every single way. I have one of each, not a single difference expect that stamp. And I run propane all the time in both, no problems. Of course, one is upgraded to the tits, the other is stock except for the enhanced recoil spring in it.
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