it was to appease the gun control crowd and they didnt think we could build the parts here, thereby banning the gun entirely...much like their attempt at the 94, 10 year ban on AW features.manufacturers simply went around it and built the same stuff here,minus the features.now, it seems they are going after manufacturers.the gun control crowd never sleeps but endlessly schemes to find ways to ban them and uses agencies to enforce their ideals,however ridiculous.they cant ban them "outright"as this might create a problem so incremental is key.hence the 86 mg,89 import and the 94 aw bans.
the us made parts usually are stamped "us" on them or clearly have made in usa etched on the receivers.other parts are numbered to clearly show make..like the g2 from tapco.some other parts are hard to distinguish.