Hi guys! This is a long shot but I don't suppose any out there has a registered form 4 MP5A2 or MP5K-PD that they'd be interested in trading for a Frankfort Arsenal M16 conversion? These receivers were purchased by Olympic Arms and are sold under their warantee. This receiver is damn near mint condition aside from a tiny bit of finsh wear from years in a safe full of guns. I'm a collector more than a shooter and the gun has around 500 rounds max through it. Everything is tight and in perfect condition. Thanks!