Is it just me being a cheapskate or is it ridiculous to charge almost $20 (tax+ship) for 1 pmag coupler? Seems like with the advent of 3d printers these things would drop to closer to what they cost to make. Has anyone made their own? It would be nice to have some on hand with the way the world is going to pot, but I guess the first thing I need to do is try to fish my gunz up from bottom of the lake...