I put a Marvel conversion unit on my Kimber and it's great. I get to pull the trigger of my 1911 while shooting 22. Weight is very close to a 45 caliber 1911. According to the factory test it shoots .65" groups at 50 yards. This thing is MUCH nicer than the Kimber 22 I handled a while back.
The only real advantages to this unit are that you get a 1911 trainer to use at .22 prices, and you can get a good accurate .22 without having to buy a new gun. The disadvantages are that it's ergonomics are not as good as a true match .22 like a Pardini or Hammerli, and the slide doesn't lock back after the final shot. Conversion from 1911 to 22 takes a couple of minutes and only involves one tool that is used to secure the conversion unit.
I've only shot the unit in what Marvel calls "extreme cold", i.e., under 40F and when using Aguila Standard Velocity or RWS target ammo the gun does not fully cock about 2/3s of the time. This may be because the unit is new and because it's colder than it's designed to work in. I'll see if it loosens up with use. Everyone else I know that has one can use CCI Standard Velocity reliably under normal match conditions. The interim solution is to use Federal Walmart bulk ammo. It's high velocity ammo and cycles the gun reliably when shooting in the cold.
This is a nice looking unit too, and very well made.
