Decided to install the fixed sight while waiting for the second. First I went to Lowe's and purchased a cheap 1/16 drill bit (they didn't have a 1/16 punch) to punch out the pin holding the adjustable sights in place. That thing was in there pretty solid, had to use a little wd40 to loosen it up. Took a few "taps" to get it to budge, but it finally broke free. Also, the first tap on the drill bit broke it in half. I still had enough to get the pin out. FYI
The fixed sight has some play so I'll have to sight it in this weekend, but it went on very easy.
Good luck with yours