BudsGunShop.com - Conversion barrel to sig 357?

Yes. Both Lone Wolf and Storm Lake make a conversion barrel to .357Sig for the G27 : opticsplanet.com/stormlake-glock-27-357sig-conversion-3-46-in-standard-length.html ---- (and) ---- lonewolfdist.com/products.aspx?CAT=241

the glock 33 barrel fits PN G8679
This is the factory Glock .357 barrel that comes stock in the Glock model 33. It can be used to convert the 27 to shoot .357 sig.
Barrel Info:
Caliber: .357 sig
Height: 1.26 inches
Length: 3.46 inches
Rifling: right hand, hexagonal
Length of Twist: 15.98 inches
Travels at: ~ 1330 feet per second
Using reloaded or lead ammunition in Glock barrels is NOT recommended!