[Sirius Lee]

I know a lot of folks will say a 20" barrel is too long for swinging around in CQC, but if you've let the feral get that close, then you've already made a big mistake. I prefer to place shots accurately at a longer distance than the can the foe.

I wouldn't recommend anything less than a 16" barrel. And a high quality scope, BLOAT, and practice, practice practice. I assume you're not going house to house hunting bad guys in close quarters. The idea is to keep bad guys far away.

[Abathar]

You are right sir, that with a good Mossberg 500 and #4 shot you are all set.

[Charles Martel]

I wouldn't recommend anything less than a 16" barrel.

Go shorter than that and you'll need a federal tax stamp from ATF.