So I found the compatibility list for everything BUT the Glock 40.
Anyone have these two and can confirm interchangeability? I wanna use the Glock 40 upper on my Glock 20 frame.
And for the record here is the compatibility list for reference.
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