blackhawk sling adapter

hey guys,
just put a new sling adapter on my dpms, dont really like the fact that the stock hits it so the stock cannot be locked and completely compressed.

Also, the youtube vids i've watched called for thread lock, where can i get this? is it a napa or checker thing?

I got the blackhawk storm sling too, below is what i got

http://t2.gstatic.com/images?q=tbn:3...ter-70sm03.png
http://www.siggysgear.com/images/18-1256-IMG1.jpg

Don't know about the sling but thread lock can be found at almost any hardware type store Home Depot,Lowes etc.