I wonder what would happen if they applied an "S" slide to the .45GAP G37/G38/G39. Would it hold up with a Gen4 recoil spring system? In my last Glock AC they told us that slide fractures sidelined G37's with 9mm/.40-width slides. BUT, that was prior to Gen4. Agencies looking to transition from 9mm/.40/.357 to a .45 could use their existing leather gear, but would still have the benefit of a 9mm-sized grip frame.
Of course, the lighter slide would rob the G37/G38/G39 of their soft-shooting characteristcs relative to the .40S&W.
It has possibilities........
Glock 17 (Gen1), 19 (Gen2), 21SF (RTF2), 26, 39
Glock Armorer (AC), Glock Instructor (IW)
Glock Advanced Armorer (AA)
Remington 870 Police Magnum, Benelli M1 S90
Smith & Wesson 13-2, 16-3, 36, 66-3, 681-3, 3000