xausa,

Thank you for the help on the letter designation. I was brain dead last night

, I guess I am brain dead most of the time.

. Too many computers crashing in the last few days.

At any rate I think, do not hold me to this for sure, that the 21 H was the half stock rifle with a 23.5" barrel and the rifle with a 21.5" barrel, both with milled receivers. The 21 F had a full stock and 20" barrel with milled receiver. The 22 versions had the round receivers.