Got some time in the shop today and the first thing I tackled was to “Fix” the problems I had last week in my 2-Gun match. I am still not sure if the movement of the front sight base on my Shorty was because I left it loose or didn’t install it in the correct spot. I also am troubled with the fact that whenever I remove the front sight I have to re-zero my gun. I decided to kill two birds with one stone. I recently bought some taper pins and a 2/0 reamer to do some work on my AR-180S project, of course I bought extra pins. I woke up in the midle of the night and thought about pinning the front sight on my 180B. Today I put it in the mill and did the deed. 
First I milled a flat spot. 
Then drilled through using a #31 bit. 
Finally reamed until the pin was flush on the bottom side. 
Then I cut the pin to length and dressed the end followed by driving it home. 
Now if I remove the front sight base all I have to do is snug up the bolts, line up and install the pin, and finish tightening the bolts. Everything will be back in the same spot. Since I was on the mill I decided to drill my initial gas port in the 180S barrel. I started with a center drill and then used a #53 drill to finish up. 
Celebrating the Armalite AR-180