That information is not known, nor is it easy to find out from the
shipping records. But - I'd guess probably 10 times as many K-38's
as K-22's . Perhaps a safer way to say it would be to say about
10 times as many .38 caliber K-frames as .22 caliber K-frames. This
way, the large number of .38 M&P's get counted, as I think they
should. We tend to think of K-38's as the target version, and .38 M&P's
as the fixed-sighted version. They are exactly the same gun, except
for the sights.

Another reason for my guess is that there was a very large LEO
market for the .38 caliber guns, but virtually none for the .22 caliber.
By and large, the .22's are for sports folks and small-caliber target
shooting; .38's fill a much larger non-M&P role.

Mike Priwer