Be on the lookout for a NEW, MKE, HK-clone/ATI AT43, 17" barreled upper receiver[5.56], and AAC SPR-M4/Miter flash hider. It appears to have been stolen off a UPS truck, or at the hub in Madison Hts [shipped on 12-15-2020]. I know there are lots of thieves at UPS, especially with temporary-seasonal help. I'm looking thru paperwork for the serial number. These model/importer of rifles are few, and far between.
In the picture I have, the serial number appears to be P00402. Best I can do with low res image.