This. Also, stocks are nowhere near that boxy, Have a look here: http://www.polycount.com/forum/showthread.php?t=72252&highlight=stock+modeling+tutorial It's a tutorial I created for someone on crymod a while back to demonstrate how to make a stock look better and not boxy.
Here is the reference image that I am mainly working from. Also I plan on baking down the floating geometry in the stock to the low rez. Should I still model it in into the high poly? Im trying to follow Racer445's Ak47 tutorial workflow.