Originally Posted by rjbFL
Thanks in advance.
What parts must be replaced to convert a Model 27 to 9mm?
1) Third Party 40-9mm Conversion Barrel;
Lots of GlockTalk folks seem to like Lone Wolf, KKM and Storm Lake.
2) G26 9mm mags.
You can also use G19 and G17 mags.
I like XGrip adapters with extended mags.
G33/G32/G23 40-9mm conversion barrels will work too.
The G23/G32 barrels will extend past the frame about 1/2".
Gen 3 G26/G27/G33 guns all use the same RSA.
9mm can be problematic when light (115 gr) and low powered.
As there may not be enough force to drive the slide.
I like to run 124/127 gr myself.
Have ~3000 flawless rounds on the odometer
with a gen 3 G27, Storm Lake 40-9mm barrel and G26 mags.
Of which over 1000 were LE hollow points.
Have Fun and good luck with your Glock!
If you go with 9mm ejector/extractor,
you can forget just swapping barrels and mags to shoot 40 and 9mm.