To select more than one answer you have to open the question in multiple windows before selecting a answer the select a different answer on each open window/tab

1 10 rounder and 1 17 round magazine with grip extension " The standard magazine holds 10 rounds and features a flat bottom butt plate; a finger grip extension floor plate is also included. The second magazine features a grip adapter and holds 17 rounds, instantly transforming the smaller, compact grip into a full-sized 9mm grip.

2 magazines