Hey did you know those are tapered??? Just kidding. There is a gunsmith here in town just west of the high school but I cant remember his name. There is a sign in front of his house on the south side of the road.
Also the smith up at Norpoint range in Arlington (Hwy 9 and 172nd) is good and very nice. He has helped me a few times and hasn't charged me.
What kind of AR? I have a Bushy and my pins come right out. Have you owned this since new? Is it possible the pins were put in backwards by someone else or the wrong pins

Maybe the end is mushroomed a little? Good luck BTW puting a torch on your sight/barrel bad idea.
The Pins should be punched out from the left side to the right.