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. 
One Reply to “Shop Time”
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I like the idea of using the taper pin on the bolted unit since it permanently references the sight block to the exact same spot every time if you need to disassemble. Once small extra step which saves time later and you save any hair that you might have pulled out in the future.