Should I stake the collapsible stock?  What dose everyone use to do it? Dose it loosen easily?

Nope.

I assume you're talking about the castle nut...

Just crank it down with a little bit of force, and thats that.  If you really care about it loosening, put a mark on the bottom of the nut and the receiver end plate, and if it moves, you'll know ahead of time before it causes any problems.

Some people use loctite...most don't worry.  I've never had a problem with any of the stocks I have put on, just put some force on it when you use the wrench to tighten the nut, but do not over tighten.   It doesnt take much to get that nut secure.

Make sure you use ATLEAST some sort of grease when you thread the tube into the reciever.  Moly grease is the kind recommended by the TM.  I've used white lithium before in a pinch, and it seems to work ok.

Scott

just crank it on.  

Thanks Guy's.