Yeah dude. Anything that doesn't need to be timed (recoil or gas-operated semi-autos) can be shortened with 30 minutes of free time and a hacksaw. I cut my Mossberg's barrel down (19", so still legal) with a pipe-clamp and a hacksaw. Did my buddy's the same way.

Oh, so it's legal to do as long as the barrel meets length requirements? I just might try that

Yep, so long as the barrel stays 18" or longer, and your overall length remains 26" or longer. [b]triple-check your measurements! [/b] Violation of the 1934 NFA by manufacturing an unregistered "short barreled shotgun" is worth 10 years in prison, and possession of the same is another 10 years. So be sure you stay legal. Also, a pipe-clamp around the barrel will help you make a much cleaner cut. Once it's cut, shoot a slug through it to debur the inside of the muzzle.