For 80 bucks more he will make a pistol rear grip so you can remove the stock. This way you have a pistol grip or you remove 3 bolts and put on a new pistol grip that has the stock. I was going to design the exact same thing but looks like someone beat me to it. I think this will be my next purchase as far as guns go. I want to make an all in one rig so I can put a short barrel for pistol rounds then put the rear stock on and longer barrel for the 7x300wsm or 7wsm.
What is the purpose of the rifle is it for varmints or a tactical purpose? what is the scope going to cost is there going to be i bipod and a tac sling or a Buttstock Shell Holder if so look at uncle mikes