Ciener may be out of business, he was arrested a few months back. His kits are hit and miss, but his customer service flat out sucks. He doesn't answer the phone or emails.

I had a Advantage Arms .22 conversion kit for my Glock 26's. It did not work 100% of the time on either gun. It was nicely made but the reliability issues were too much to deal with. IMHO, one would be better off to purchase a .22 handgun. My AA kit listed for $325.00 and had an optional extended, threaded barrel for suppressor use, another $130.00. That kind of money will buy a nice .22 handgun.

Some ammo is just plain filthy, and rimfire ammo is among the worst of nasty. Test several types of ammo in a firearm to determine what it likes the best. I always thought PMC and Aguila were dirty burning ammo.