I was under the impression that the 21 was a sporting rifle and the 22 was a carbine with a full length stock. I noticed that the Blue Book states that the 21 was available with a full length stock and with or without integral scope mounts, but who knows if they are correct. I have a carbine in 7x57. I always thought it was a 22F? Guess that I will look through my collection of Gun Digest to see if they have anything on BRNO.

I learn something every day, and a lot of times it's that what I learned the day before was wrong