jeray

OK, I am a newbie to the whole shotgun thing in the first place, but I have wanted one for a while so I bought a Benelli M1S90 Tactical. It has a pistol grip and rifle sights. So the first thing I did was but the 4-shot mag extension on, cause, you know, 8 is better than five right. Then I get on this board and I start reading all the legal stuff about the M4/M1014, and now I am wondering if I have done something illegal. I called my local dealer (a class III dealer) and asked them, and they said it was fine. Is this the same thing as with the M4? Should I mail the ATF?, who can give me a definitive answer? Also, what is a good cheap round to run through this thing and allow it to cycle, just for target practice. What is the preferred defense load? Thanks, Jeray