New Rock River Arms Spanner / A2 Stock Wrench as shown in the picture for AR15 rifle.

This wrench is designed especially for the 6 position stocks that have 4 notches on the locking ring.
This wrench will engage 3 notches for a no slip grip to easily install or remove the stock without slipping or damaging the ring.
Also has a socket for the Standard buffer tube so it can easily be installed and removed without rounding off the end.
Heavy steel , 8″ long.