Charlie,
Please post hi-res pics of everything you can, whenever you can. I'm curious to see the extra upper and whatever accessories or modifications relating to them you can document, all the markings wherever they appear, etc. The forum members can help figure out just what you have, whether it's OK to install and use the rear stock, etc. The bbl for an Artillery model would have been 8", with an adjustable leaf sight on the breech end. This would likely be legal to use (I think the serial # would have to fall within the range of the Artilleries' manufacture.), but if it's another length, then likely it would not, per the letter posted above.
David Parker
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