| It is asked often and many folks get the wrong information, so we are going to show the Glock owner and the generally curious all of the possible Upper/Receiver combinations in the Glock. In other words which uppers work on which receivers. * Indicates ejector and mag change. Receiver------------Upper/s G17.....................G17,17L,34 G17L...................G17,17L,34 G19.....................G19 G20.....................G20,G21 G21.....................G20,21 G22.....................G17*,17L*,22,24,31,34*,35 G23.....................G19*,23,32 G24.....................G17*,17L*,22,24,31,34*,35 G26.....................G26,27*,33* G27.....................G26*,27,33 G29.....................G29,30* G30.....................G29*,G30 G31.....................G17*,17L*,22,24,31,34*,35 G32.....................G19*,23,32 G33.....................G26*,27,33 G34.....................G17,17L,34 G35.....................G17*,17L*,22,24,31,34*,35 |