It's a full thread bolt. I figure it doesn't matter if the threads get smashed a bit (unless it creates slop that causes a problem) - the first piece of metal it goes through isn't tapped.

I drilled the safety wire hole myself and I got a heim safety washer from ballistic fab (though I had to grind it down a bit - it was thicker than the other safety washers we'd designed the distance around.)

Oh - for anyone else that needs the info, the stock bolt is a 3/4" 16TPI 1.75" long grade 8. I'm using a 2" now.