The TX3-N Tactical Takedown Tool for New Build includes an endplate which has a unique locking station to hold the magnetic takedown assist tool. This patented design now gives you the ability to carry a takedown tool on your AR style rifle within the endplate. Our design allows you to have a takedown tool attached to the endplate without impeding your 6 position butt stock. When the butt stock is fully retracted, its like our tool is not even there. Not only that, but the TX3 (tool and endplate together) weigh less at .4 oz than the standard metal lower parts kit endplate.