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David, unfortunately they are proprietary. Sorry but hope this helps.

David, the MC2sc pistol is designed to accept magazines for the popular GLOCK 43. --- https://gunsmagazine.com/guns/handguns/mossberg-mc1sc-9mm/

David, these are proprietary to the MC2sc. Only the MC1sc can accept the Glock 43 magazines, not the MC2 as James suggested. The MC2sc pistol uses proprietary magazines. Have a great day!