Generally, when you apply for your Form 1, you set forth the caliber of the SBR/SBS, but you can put "multiple" in the caliber field and it should be legal as either a SBR or a SBS. You will be engraving the receiver of the Contender, and you should mark "Caliber: Multiple" as well as the other required markings as well. But I would sincerely suggest a phone call to the BATFE before even submitting the Form 1 just to make sure that smoothbore and rifled bore short BBl firearms can be assembled on one receiver so marked and approved as "multiple caliber".
Willie
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