Most info on the Stevens 520 only lists it being available in 12 ga. Has anyone seen a 520A in anything but 12 ga.? I've only seen the Western Field model 30 SB562A in a 12 or 20 ga. and have only heard of Western Field gun owners asking questions about their 12, 16 or 20 ga. guns. Does anyone own a Stevens 520 or 520A in 16 or 20 ga.? I know of a few Stevens model 200's (520 style gun) made from 1912 thru 1928 (only available in 20ga.).