After a good showing today I think that for now I am going to stay with the Marvel 1 and 2 for Steel Challenge http://www.marvelprod.com/ -they are reliable enough after my mag tuning efforts and are well known for their intrinsic accuracy. The Advantage Arms Target Unit http://www.advantagearms.com/ had a few bobbles that I believe were related to a heavyish mainspring in the particular frame I installed it on. Will try again..for best results you should use a 19 or 20 pound hammer spring with .most 1911 22 Kits. I am also not too keen on their polymer mags-hard to load... I will stay with metal for now....just call me a Luddite.
At any rate, the I am ready to take on all comers with my iron sighted .22! LOL
Here is the one I really want http://www.bobmarvel22conversion.com/index.html