I have a LWD black oxided, blind marked, 9mm conversion barrel for my G27. I wouldn't use it for carry/SD, but it makes range and IDPA practice a bit more economical. IMHO not QUITE as reliable as OEM .40 barrel.
Last time I used the LWD for IDPA I broke 210 which WOULD have classified as Marksman if had been a G26 (SSP, but not ESP) in spite of 1 FTE out of 90 rounds. (Reliability may also be a function of using weak 9mm ammo for range and IDPA)
Luke 22:36 He said to them, ď... if you donít have a Glock, sell your cloak and buy one."
°Glock don't need no stinkin mods!