“MEC-GAR BUTT PLATE +2 Adapter”
The “Plus-2” Adapter is a replacement set of hollow butt-plate and inner base
to further raise the capacity of the following Mec-Gar magazines:
MGPB9218AFC, MGPB9613AFC, MGCZ7517AFC, MGCZ4012AFC, MGP22618AFC,
MGP2264013AFC, MGPT9218AFC, MGCZ7510B and MGPT4013AFC.
The “Plus-2” Adapter will not work on other magazines.