Col..,
Not gonna pose as a Glock expert, but I believe you can put just about any Glock barrel on the G29. Lone Wolf sells after market barrels that are longer, compensated, change caliber and just about anything else you want to do. About the only thing you shouldn't do, is put a barrel on that's shorter than the slide.
I just bought a G20C and plan on getting a 6" barrel in 40S&W. And maybe later a .357SIG.
O
