So I got everything I need to use my YHM R9 on the handguns, now trying to finalize what I need to put it on the MPX.

Found a direct thread mount (Ecco Machine) that specifies:

” Unless denoted with “MR” for Muzzle Registering, 1.375-24 Bravo direct thread mounts are THROUGH THREADED; they DO NOT have an internal shoulder to register on muzzles. Muzzle Registering mounts (“face mount”) have the internal shoulder 7/16″ (.437″) from the rear face for M13.5 and M16, 1/2″ (.5″) from rear face for 9/16, M14 and M15.

M13.5×1 LH MR mount is compatible with the Sig MPX & MPX-K having that thread. Note: it will engage the muzzle, NOT the taper; we do not offer a 13.5×1 LH mount which utilizes the taper.”


Part is listed as “M13.5x1 LH MR”, so am I reading correctly that this will mount properly to my 8” MPX with tapered barrel *without* the need for the “tapered barrel adapter”?

That’s exactly what it seems to say.