John you state "My only caution is that you should NOT attach a shoulder stock, as that would be illegal as a Short Barreled Rifle (SBR) (since the barrel is under 16 inches)... unless you pre-register the gun with the BATFE and pay the $200 tax stamp in advance for making an SBR ...
As long as I don't attach the shoulder board, it is legal to shoot? I have a 9mm 12" barrel that I have attached to a lower that I also attach a receiver for a .22 cal and a 30 luger receiver to. Will attach my set-up:
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