Crooked gas block?

[Vancouvergunnut]

The DD one has the thing sticking out the end, that's why it's longer. Will fit no problem. And for both of those rails you need the handguard cap.

cool, thanks. I assume the DD one will actually fit a lot better, the current one i have is about 2mm lower than my upper rail which is annoying.

 

[-[Crosshair]-]

And for both of those rails you need the handguard cap.

This. You don't need to take the gas block or anything off to install it.