As far as ATF regulations, the answer you have here is exactly correct.
If its a rifle, you must maintain a 16" barrel and 26" total length. As long as you do that, by ATF regulations, you are completely, indisputably legal.
If you want to figure it all out for yourself, look up these laws:
26 U.S.C. 5845(a)(3): DEFINITIONS (FIREARM )
26 U.S.C. 5845(a)(4): DEFINITIONS (FIREARM)
26 U.S.C. 5845(c): DEFINITIONS (RIFLE)
27 CFR 479.11: DEFINITIONS (RIFLE)
27 CFR 479.11: DEFINITIONS (PISTOL)
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