I've got a Bushmaster pre-ban lower, verified by the factory that it was sold as a stripped lower prior to the ban. I also have an affidavit from member "RMClark" attesting to the fact that said receiver was built into a complete rifle, prior to the ban. If that is acceptable to you, I'll trade you the aforementioned lower, sans grip. My lower is also in mint++ condition and has a four-position collapsible stock, (black).
Let me know.