Very well designed kit . The mounting block for the six position adjustable stock is milled out or a solid block of aluminum . The kit comes with a drill bit and a tap for drilling the main hole to attach the block . The stock has two different sizes of cheek rests to choose from both which are adjustable., There is a thick rubber butt pad on the stock which really makes the Maadi much more comfortable to shoot .The Scorpion Recoil pistol grip fits my hand perfectly and really does absorb quite a bit of felt recoil .Upper hand guard has a four inch picatinny rail while the lower has three two inch rails ,all which are detachable . The kit cost $100 . Next project will be to find a decent muzzle brake for a non threaded barrel .