Have a 12g M37 with a compensator and a full choke, wish I could find a couple other chokes for it.
I saw some listed for sale recently, 2 or 3 with a wrench if I recall correctly. Can't remember if it was on #######, trapshooters.com or shotgunworld?
I have a Cutts equipped Winchester model 50. Works well but it is LOUD.
Darryl