I'm not certain about the details but there is a Remo Popular made on the 71 & 71/84 Mauser. Then a Remo - Geha - Hard Hit all based on the 98 Mauser action. Again not certain but my understanding is that the 98s could be had 20, 16 & 12 gau., but I have never found a 20. Except for the 71/84 I have one of each model, the Remo 98 is a good looking gun, I understand there are very few of that model around. FWIW. --- John