For the AR15 any primer with a cup thickness of .025 will work fine, with thinner cups the risk of a slam-fire increases. The greatest risk of a slam-fire is if a single round is loaded WITHOUT the magazine in place and the bolt is allowed to slam shut. With the magazine in place the bolt speed is reduced as it picks up a round and feeds it into the chamber.
Here are some primers with a .025 cup thickness;
Remington 7 1/2
Wolf SRM, (Small Rifle Magnum)
Wolf SR223, (Small Rifle 223)
If I were going to use any of these primers as a sub, I would reduce the charge to the minimum and work my way up loading 3 at a time and look for any signs of over pressure. Some may not be comfortable doing this, but this is my approach when ever I sub out a primer.