It's a matter of federal law, applicable to all states. For a rifle, it must be at least 16 inches. For a shotgun, 18 inches. Anything less requires an NFA Class II permit for a short-barreled rifle or shotgun.
No
30 inches. A longer barrel gives you better accuracy.
The primary difference between a semi-auto rifle and a semi-auto carbine lies in their design and intended use. A semi-auto rifle typically has a longer barrel and is designed for accuracy at greater distances, often chambered for more powerful cartridges. In contrast, a semi-auto carbine generally features a shorter barrel, making it more compact and maneuverable, and is usually chambered for less powerful cartridges. Both operate on the same semi-automatic mechanism, but their specifications cater to different shooting needs.
16 inches, as required by the NFA.
See A(6) here http://www.atf.gov/firearms/faq/faq2.htm#a6
Federal law is 18
Single barrel, over/under, side by side, semi-auto, pump, lever, full-auto
Should be marked on the barrel
Check the receiver and barrel.
50-500 usd
Have a Model M-846 (Montgomery Ward) semi auto with 18 inch barrel.
Single barrel, over/under, side by side, semi-auto, pump, lever, full-auto