At the bottom of the pic you will see a alloy tubing, thats my bushing install tool. I install the kit before the bushing, then slide the bushing over the OP rod and slide the tool over the op rod and then light tap in the bushing.
I have enough alloy tubing for 1 more install tool if you want it.
WARNING, if you haven't done this before the bushing does NOT GO IN FLUSH, if you over hammer it to hard you could crack your upper receiver, bushing should stick out of the hole into the upper a little.
I also modified some special punches years back when I installed a lot of these kits.
I have enough NEW parts to do 2 kits. NOT 4 Sale, but I will give away a bushing.