Rhino1

My M2 is new so don't have a long track record yet. Mine has the 21" barrel so bought the 5 extension tube. I bought direct from Nordic. They were out of stock at the time but delivery was quick. They are good folks and were helpful. I bought their low friction follower and a clamp. Looked at other manufacturers but Nordic seemed to be uniformly mentioned as the best. Also Benelli's new 3 Gun shotgun comes with Nordic extension. I consider that a pretty good endorsement.