I have an M2 tactical that I like a lot. It is the only auto-loading social shotgun I have really used much. Most of my prior experience has been with 870's. I am a big fan of the Vang-comp system which gives you a cylinder bore barrel that patterns like a full, but he can't do the mods on an M2.
I run an improved cylinder choke on my M2, so I can switch between buck and slugs. If you are going to carry buckshot only, then go with a full choke.
Also, if you have the option, check out the Mesa Tactical stock. It greatly improves the LOP and he ergonomics of the gun, at least for me.
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