Thanks George. I have an original full-page ad that they ran for years in North American shooting mags. It also mentions only 12 & 16. I.m wondering if they might have been available only in Europe or whether they forged some actions, decided not to go ahead with the 20's, and made the actions available to the trade. The fact that the retailer of this rifle is in Brno, tends towards the later theory. Machacek is still in business by the way, but I've had no response to my inquiry of them.