Would trade for a 2-stage, like a Timney Calvin Elite, prefer flat, can add a little $$ where necessary.
ETA: Another trade interest is a 15"+ rail, something like a "Expo Arms M-LOK E-Series Handguard - Black - 15". I do not have a preference between M-LOK and Keymod, but it needs to be at least 15", +/- cash depending on the rail.