The Glock 45 combines the full size grip of the 17 with the shorter slide of the 19. That mix decides what fits it: grip and reload parts come from the 17, while the frame mount is the one made for the 19, 19X and 45.
Grip and reload from the 17
The 17 gen 5 adhesive grip and both aluminium magwells list the 45, so a 45 can be set up like a 17 for faster reloads; see Grips for Glock 45 and Magwells for Glock 45. Base pads from flush to +9 are in Base pads for Glock 45.
Frame mount from the 19
Because the slide and dust cover are the 19's length, the aluminium frame mount made for the 19 family fits; it is in Frame mounts for Glock 45.
Sights and dot
Co-witness sights for MOS slides and standard sets for classic ones are in Sights for Glock 45. Most 45s have MOS; for those, Optics ready plates for Glock 45. Where a slide lacks the cut, Red dot mounts for Glock 45 has the dovetail option.
Frequently asked questions
Does the 17 frame mount fit the 45?
No. The 45 takes the mount made for the 19, 19X and 45.
Does the 17 magwell fit?
It does; both gen 5 magwells made for the 17 name the 45 as well.