Reciprocating cover with release button for clearing damaged shells; Assist buttons on each magazine tube to make loading/unloading easier; Push button magazine tube selector; Ammo adaptability; Two independent magazine tubes; Tactile loaded chamber indicator; M&P grip with four interchangeable palmswell grip inserts; Ambidextrous safety selector; Picatinny-style rail on top for sights/optics; M-LOK slots on barrel shroud