Don’t get all excited.
I’m planning on either vacuum forming or cutting foam inserts for these so I have an easy way to move my guns without boxes in case of a fire evacuation. Better prepared than not!
Sad they separate the gun from its factory original box.
On a MK series the “upper” is the receiver.It is my understand that only the receiver number needs to be registered. Bur smart people may come along and differ,
If selling on eBay those parts are used and if they are selling as NEW they are in the serious wrong. The Volq-pulled parts shouldn't affect new parts prices one bit.Then dump all the remaining parts on the market at stupid low prices, which has driven the used parts prices through the stratosphere.