Anyone know of one other than the ADM and tango down ones? Might just make one myself otherwise. $60 is a lot for a rail section and plastic locking tab.

Well, I guess I'll be modding up one myself.  I'll try to post pictures after the parts come in.  Basic idea at this point is to take a solid rail cover, smooth a spot down, and then mount one of the TangoDown hat mounts to the rail cover.  Probably will bed the unit with JB weld/RTV to make sure it seals up tight after test fitting.  If this doesn't work, I guess I have a fancy mount for a hat