So, after doing quite a bit of searching online, I cannot find an extended mag for my JC Higgins model 20. This doesn't come as much of a surprise seeing as this particular shotgun hasn't been manufactured in...i don't know...30 or 40 years I guess. Anyway, I saw one source online that said that a Mossberg extended mag might fit it. Is there anyone that can confirm this? If not, can I weld on a piece of steel pipe to make my own extension? I know it might not be pretty but I'm more concerned with function than aesthetics. I would appreciate any insight. Thanks.