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Yes, this will work with mini shells. From what I'm reading it'll hold 20 mini shells all together. Hope this helps.

Douglas, this would depend on the length of the mini shells used. Each tube of the M&P 12 can hold up to seven rounds of standard 2-3/4-inch shells, or up to six rounds of 3-inch magnum shells. 14rds of 2.75 inch shells = 22rds of 1.75 inch mini shells plus 1 in the chamber.

Doug, per S&W this does accept & fire mini shells with no problems. It will fit 10 shells in each tube, or you can mix & match mini shells, 2 3/4" and 3" shells. Have a great day!