I've had this gun for quite a while, but I'm just now starting to modify it. I'm looking to pick up a pistol grip. What would you guys recommend? I'd like something that's rubberized, and still trying to decide whether or not to go with beaver tail. If I do go that route, is there a certain one that would mount with no gap? The other thing I'm looking for is a short M Lok rail that'll allow me to attach a foregrip to the bottom of the handguard.