Protector

I have an M1 Super 90 12 gauge, that I absolutely love. I am a working police officer and now have permission to make it my carry shotgun on patrol, but is has a 28 inch barrel. On line it appears that M1 barrels, especially shorter ones, for sale are very rare. I am new to Benelli's, so my question is will an M2 barrel work in an M1??...and if not, is there a good place to look for an M1 barrel??. Thanks for any help with this.