Not good for ar style rifle imo - American Built Arms Company Urban Sniper Stock

So, this thing is pretty solid and the price is right for the adjustability you get, but do not think to use it on an AR style rifle unless you like a really long length of pull. If you install it with enough room to charge the weapon, it will be about the length of an A2 stock with the adjustable butt pad all the way collapsed. You also can't charge it by simply lowering the cheek riser all the way down, still clashes with the handle.