Quite an interesting read.
Feds seek to keep assault rifle parts that were seized.
Apparently, Stag Arms (made famous by their left handed AR, and kept relevant by their quality craftsmanship) screwed up and had a stock of firearms parts that had not been engraved with a serial number.
Per the article, there was blame to go around. First off apparently the person who was supposed to do the engraving was on vacation. That was one heck of a vacation for such a backlog to develop. Second excuse was that they kept some items un-engraved in case there was a screw up and they needed to replace a part. That is a big ATF no no!
Apparently the government wants to keep some of the items for government use. I'd assume that the lawyers can argue something about the 4th amendment that the courts have poked holes through and therefore it would be a useless argument unless it got up to the Supreme Court.
Well, read the article for yourself. Come to your own conclusions. It's better that way.