I purchased an Advantage Arms, Inc. .22 lr conversion kit for my GLOCK 23. It's the L.E. 19-23 kit (fits 19-23-25-32). It came with one mag and everything for cleaning. Also I got (I think) a deal on 3 additional mags. The mag that came with the kit is plastic with metal lips, can not be disassenbled, of the additional 3 one is a Advantage Arms the other 2 are are not marked. The kit mag is marked on the bottom and has contured sides the 2 unmarked are flat sided. All 4 seem to work the same.
Tried it out today with multiple brands of ammo, Wolf, Remington, Federal, Winchester and a couple more imported brands.
I had 6 malfunctions in 440 rounds, 2 failure to feed (one nose up and one down) and 4 stovepipes.
The info with the kit states that Federal ammo does not work well with it but I had no more problems than with the other brands.
The kit is a slide (aluminum), removeable barrel and recoil spring. With it mounted on the frame the whole thing seems to weight nothing.
This thing is a pretty good shooter, not target grade by any means but as or more accurate than a Buckmark Camper I owned or a standard Ruger I have fired.
The stovepipe malfunctions seem more ammo related than otherwise. The round fired prior seemed weak and on the last two stovepipes I could tell when they were going to happen.
It has already helped me in that I have found that when I rapid fire I have been changing my finger placement on the trigger slightly causing my groups to open up a little.
Recoil is of course none and the sights are GLOCK with adjustable rear sight (neat).
At 7 yards I could keep 2 to 3 inch groups at slow fire, me not the gun, and 5 inch groups in rapid fire.
The kit cost $250 and I got the 3 additional mags for $25. Overall I am very happy with it. The mags are 10 rounders by the way since Advantage Arms is located in Valencia, California.
I also got a look at a Ciener (sp) Arms conversion kit, very nice, also.
Advantage Arms Inc. - Handgun Conversion Kits - Official Manufacturer Site