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Message: <blockquote data-quote="mr ed" data-source="post: 2761873" data-attributes="member: 6777">the only difference is a hook on the hammer and a slot at the back of the trigger. tens of thousands of these were sold in fcg kits during the 70's-80's. they were cheaper and the ATF wasn't so uppity. there is no difference in their operation than the semi-auto trigger and hammer. you also have to remember the ATF  changes its mind constantly and it wasn't that long ago you couldn't have a m16 bolt carrier in your gun.</blockquote>