I was at the range Sunday and put my conversion into my m4gery (colt upper) until this point it had always ran great but this was the first time I've used it (or tried) with my new gas busted charging handle. Well long story short with the gasbuster I couldn't charge it or rack it back more then half of an inch so I swapped over to a spare I had and it worked fine.

Has anyone else had this problem?

They dont work with the 22 kits unless some mods have been made.