This is a factory 12ga 3"Mag. 18" Benelli Slug Barrel wirh sights that was cut/crowned by gunsmith to a Handy 18"..Then it was Cerakoted a Matte Black finish..This is not a smooth bore but a Rifled Version. These will fit your M2 or M1 Benelli but the Slug Barrel is a bit thicker so you can dremel it a little to fit or purchase a Slug forearm. These are very accurate with Sabot loads and if you want Aot of Power go for the 3" Brenkke MAGNUM CRUSH Slugs..666 grains at 1500fps for 3800 ft pounds! Very handy in the woods or deer stand! Great for Alaskan Bush too! Barrel shows as New and $515 shpd..