The 14" barrel Shockwave Edition works in Federal law because it meets the 26" OAL minimum and never had a stock, and is transferred on a 4473 just like a pistol -- this classification requires that it never had a shoulder stock, and no stock was included in the box. Mossberg has had a handful of PGO models in their catalog for years.
New Hampshire law's only reference to barrel length iswhat I quoted above from RSA 159.
Correct. I was specifically addressing the incorrect comments on legality in the state of Massachusetts by The Downtrodden