My son just finished Basic, AIT, and jump school these past few months. He is now in the 82nd Airborne as a Combat Engineer at Ft. Liberty(Bragg). He was so excited on getting to use the M4 because we had shot it so much before he left and he trained with it. When he got to the breaching part of his course on how they teach them how to breach different doors, walls, etc, and when they got to talking about using shotguns to breach his drill instructor pulled out the M26 MASS. My son said his heart fell lol. He asked them about the M4 and they said that the M4 will no longer be used in the Army for breaching and will be removed from rotation at least for the average soldier. Maybe SF still has them or uses them, but no longer for the average soldier. Kinda sad, because he said the MASS absolutely sucks and the recoil and handling on it is horrible.