I have a Gerber Mark I Fighting Knife, it is in great shape but someone has sharpened it (not so neatly). It has the original sheath. The knife and the sheath look as they have never been used, just sharpened. Would like to trade for a RRA entry buttstock with buffer assembly, or similar. To be installed on a post ban so I really don,t want a fixed callapsible. I can email pics.