Earlier this year, I ordered directly from Mason Precision their 22 cylinder reamer and received in less than a week. To date, I have reamed the charge holes on my 22/32 Target model and 17-3. After reaming, both are a joy to shoot. Ammo is effortlessly loaded and emptied easily extracted. Interestingly, my K-22 shipped in 1953 did not require reaming.
I have lent the reamer to two other shooters for reaming of a k-22 and a Model 17 and they are equally pleased with the results. I highly recommend the Mason Precision reamer.