Tom, just owning the combination of a Luger with a stock lug and an inappropriate stock (without owning the appropriate Luger) could be considered "constructive intent" even if you never attached it.
Short Barreled Rifles (SBRs) are considered a NFA firearm, and require special transfer and licensing. Many local jurisdictions also prohibit NFA items.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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