I thought I would start this thread in hopes of it to be bartacked to the rimfire forum (sticky). It just makes sense to have a single place for a thread for these kits since they maybe the most popular .22LR conversion kit for Glocks. Please comment on this thread if you own one of these units. I will post chronograph #s and other observations for my unit on here for others to have a look at. When I first purchased my G29SF last year, the first accessory I wanted to buy for it was a Advantage Arms kit. In fact, my kit arrived quicker than my Double tap ammo did - despite ordering the ammo before the kit. Like most Americans, .22LR is my favorite cartridge to shoot because it is cheap, capable of excellent precision, has killing power out of proportion to its size and it's lightweight to carry afield. While I'm on the topic of lightweight, the Glock in the AA .22LR mode makes for the lightest weight rimfire pistol I have ever held. The receiver is made of aluminum, with a steel barrel, extractor and other small parts making the overall weight quite low for this unit. There are two models: The target model with fixed sights (which seems to be MIA) and the LE model which has a Glock style dovetail & pin-placement sights. The sights on the LE models are actually Glock adjustable sights. These are cheap sights, but they will suffice for plinking - the key point is they can be removed and replaced with target sights relatively easily if the user wants. I replaced my own sights with Dawsons, but I'm not much for the Glock sight profile personally. I purchased the LE model 29/30, which is for the compact G29 & G30 Glock models. Because it is a compact and seems somewhat oversprung, I have found that my unit works better with the hyper velocity (CCI stinger and Velocitors work great) rounds than it does regular high velocity ammo for which Advantage Arms recommends. AA recommends Remington Golden bullet (550 pack), Remington target, and CCI mini-mags. I have experimented with lots of different ammo types on my unit and found that Federal #719 high velocity match turns in the best precision. The only ammo that I have tried and found cycles with full reliability is CCI velocitors. The high velocity loads have a fte and ftf problems ~10-20% of rounds cycled. As for target or subsonic rounds - forget it. They just don't cycle in the unit. Chrono'd rounds with this unit: I first shot (2) mags of remington golden bullet ammo through the advantage arms 29/30 LE kit - this is Advantage arm's #1 recommended rimfire round for their kit - which is designed as a plinker by default - and not a target pistol (though it's not too bad in this respect). The ammo however, leaves something to be desired: Conditions: 85F, RH? (probably around 40%), 1400 feet asl, quite sunny (hence the errors) Shot1 809 Shot2 878 Shot3 800 Shot4 871 Shot5 920 Shot6 913 Shot7 905 Shot8 908 Shot9 957 Shot10 771 Hi: 957 Lo: 771 Average: 873 Extreme spread: 186 Standard deviation: 60 Okay, that was fun: How about doing it again: Shot1 916 Shot2 803 Shot3 968 Shot4 905 Shot5 885 Shot6 812 Shot7 983 Shot8 911 Shot9 no reading Shot10 no reading Hi: 983 Lo: 803 Average: 897 Extreme spread: 180 Standard deviation: 64 Wow, that ammo sucks! (but at least it feeds and fires, right?) A couple more tests for the Advantage arms model 29/30LE .22 conversion kit for Glock. Remington target: 1. 847 2. 821 3. 851 (fail to eject) 4. 853 5. 884 6. 828 7. 866 8. 881 9. 737 (fail to eject) 10. 768 Average: 833 Std. Dev.: 47 (aka a slower, uncoated bulk golden bullet - precision poor) Note: Rem golden bullets have shown STD. dev. around 60 - with precision to match! Today I had a 10 shot group that measured 21 and it had good precision. I was amazed! Federal #719 (HV match) 1. 951 2. 955 3. 957 4. 959 5. 987 6. 992 7. 998 8. 985 9. 992 10. 969 Average: 974 Std. Dev. = 18 (not bad! - Very good precision) CCI Velocitor 1. 1020 2. 1040 3. 989 4. 1016 5. 1008 6. 981 7. 984 8. 1026 9. 978 10. 993 Average: 1003 Std. Dev. = 21 (also not bad, precision about the same as #719) #719 = the win for value of all the rimfires I have tested with this unit. Velocitor just doesn't "velocitize" with a barrel this short. I know from testing it in water jugs that it won't expand much at all running at this speed, either - so not much benefit of having a hollow point that won't expand. Next I will chrono some stingers when I get the chance. I already know that precision with the stinger round is just not quite as good with other rounds, but from previous testing, I know it bullet will expand if it hits something square on. Speaking of precision, though AA states 2"@25y as the limit of this conversion kit, I have not been able to obtain that level of precision with this unit. (Then again, I don't have a ransom rest). From a bench the unit I will group (10 rounds) about 3.5" @25y. I do not have a scope mount that works for this gun (yet), though if I did (when I do) I expect I could get that down to the 2.5"-3" range. This level of precision is good enough to hunt small game with, but you'd better limit your range to around 50 feet or so. Overall it's a good addition to your centerfire Glock.