Is there a penalty for owning a short shotgun barrel?

Hi I am a 23 year old that loves target shooting. Firearms is a hobby of mine like many dudes. I have been thinking about how I would be able to build a short barrel shogun build really just for the fun and experience of it. According to federal law its illegal to own a short barrel shotgun but I have not found... show more Hi I am a 23 year old that loves target shooting. Firearms is a hobby of mine like many dudes. I have been thinking about how I would be able to build a short barrel shogun build really just for the fun and experience of it. According to federal law its illegal to own a short barrel shotgun but I have not found anything about owning a short barrel that is not attached to the gun itself (removable emington 870 barrel) is this something that is legal to own or is it the same as owning a short barrel shotgun that is fully essembled? Thanks!
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