I am building a rifle that is going to have a folding stock. The stock has to be collapsible or adjustable. What are some of the thinnest stocks on the market?
Probably the Moe/CTR. It's pretty thin.

I'd say the para ordnance Rapid Deployment Stock.
You gotta pay to play though
$340
The old Car stock is probably your best bet, don't know if anyone still makes them but they pop up on the EE.
Plus another $1700 for the upper that is required to make this function