I ran a couple JP's original kits for years, then stumbled across a Timney Competition cassette for an attractive price, so bought it. I was expecting it to have no creep, a crisp release, and no over travel, and that's what I got. It took a bit of break-in, but it's now as good as any of my Timney bolt gun triggers. The Timney uses set screws to retain the pins, but I added anti-rotation pins for extra insurance.
No AR trigger (that I'm aware of) is fully immune to a primer getting into a bad spot and causing a stoppage.