Adding a stock to a shockwave question

[MolonLabe416]

If I were to want to add a stock to a shockwave, would that be an SBS or an AOW?

What determines the answer?

Thanks.

[HCM]

If I were to want to add a stock to a shockwave, would that be an SBS or an AOW?

What determines the answer?

Thanks.

Stock = SBS

[txdpd]

I am not a lawyer, I did not stay in a Holiday Inn Express last night, and this is worth as much as you paid for it.

Adding a stock would make the shockwave a shoulder fired shotgun with a barrel under 18" in length and it would be an SBS. IMO what determines the answer is that a stock would make it shoulder fired.

https://www.atf.gov/file/58196/download