That's a very good price for those barrels. I have a G23 with the LWD 40-9 conversion and the LWD 357 Sig (G32) barrels. i use 9mm mags with the 9mm ammo and the G23 mags for the 40 and 357 Sig. Some time ago, the G23 mags has thick plastic under the feed lips. Many guys just filed them to be thinner. That seems to work.
I got these barrels when the gun was new. It would occasionally stove-pipe 115g WWB 9mm. It now has about a case through it and can shoot any 9mm just fine with a firm grip, even Federal. I like these barrels. They come with a life time warranty. I think LWD is a fine company that really cares about their quality and their reputation.