I bought a Sig 556 classic at Gander Mountain this week, our local shop was sold out of, well everything. I think Gander gave me the handguard they sell on the 551 for some reason. http://www.ar15.com/archive/topic.html?b=6&f=45&t=297075 Those pictures confirm, I have the handguard on the top of the picture, not the one on the bottom. SO the upside is I got a nicer handguard, the downside is I cannot attach rails to the handguard, which is a bit of a bummer because I definitely want to attach a bipod. Anyone got experience with this issue? Should I ask Gander to provide me with the factory handguard for the model I bought? Anyone dealt with Gander on something like this?