denko,

to 10mmTalk! I have not seen a 9mm barrel for the Glock 29 but have seen the 40S&W , 357 Sig and 9X25Dillon conversions utilized with the stock magazines.
If you were to try the 9mm you would need to have a 9mm magazine as well...it would be better to just buy a 9mm pistol that to modify a supurb pistol like the Glock 29.
best regards and enjoy the form!