[chaldean]

Is it usually kinda hard to change the stock positions?

If its all the way closed i gotta actually pull on it... does the screw under it have anything to do with it?

 

[RoninSteel]

I don't have a DPMS stock but I would guess that if there is a lot of resistance to changing positions that there is some kind of set screw or 'vice' type grip there to keep it from wobbling somewhat. Try messing with that screw on the bottom that you talked about and see what happens. Its very unlikely that releasing that screw a bit will damage anything, so give it a go.