I’d go with the 12g, there is only about a 6oz difference between the 20g & the 12g. I have a Maxus, which as BGT pointed out is practically the same gun. 12g, 3 ½” chamber, weighs 7lbs, light enough to carry all day. Cycles my 3/4oz reloads, 3 ½” magnums and everything in between.