One of magpul's best - Magpul Industries UBR Gen2 Collapsible AR15/AR10 Carbine Stock

I thought this would be a good stock to put on my first AR build, and I was right. It came with all the tools I needed, and was simple enough to install with the included manual. It weighs over a pound, so it will add some weight to the back end of your rifle, but that should help balance out whatever accessories you decide to add to the front such as flashlights, PEQ units, or suppressors. Plus that added weight softens the recoil impulse ever so slightly, but every little bit helps. Overall, this is a great addition to anyone's rifle who doesn't mind a little extra weight compared to your mil-spec M4 collapsible stock, but many shooters that might be a good thing.