[My first benelli and so many questions]

I just bought a brand new M3 and the sights look exactly the same. They seem tough enough to me, and I'm pretty hard on my toys. Good buy it seems.

[M3 Upgrades]

I just bought my first Benelli (M3) and was wondering if it is possible to attach a collapsible stock (M3T) Legal issues? Also, tube extensions and legal issues. Any advice would be greatly appreciated!