They should be interchangeable with MT, Accumate and McHenry, but still working out the details. Mike
I'm still working on it, but this is what I have so far: http://shpws.me/KV2y The dimensions of the coupler box are based on the NSN extended box, but with additional modifications for a body mount screw as well as a coupler box screw. There are also inset pockets for MT couplers but I haven't tested those yet so I don't know how well the geometry will work. Accumates and McHenry couplers should work fine in the box.
