Stock ball detents that use a Derlin or steel ball.
X-Mag, Freak, Evlution II, ACI Bulldog II
Very easy on the paint, won't blow out, broken paint doesn't affect it.
Doesn't work well with a Halo hopper.
I bought this detent because I was having a lot of ball breaks in cold weather, but the Planet Eclipse Fangz has turned out to be the best ball detent I've used on any gun. The manufacturer recommends that a drop of blue Loctite be used to hold it in place, I've placed a thin o-ring that I pulled off one of my old angel detents over the threads to hold it in place. The only down side that I mentioned earlier is that it won't work well with a Halo hopper, they put too much pressure on the balls in the stack and the Halo will actually force balls past the detent. You won't have problems using this product with any other hopper. These detents are made for all markers that use a threaded ball detent, make sure you get the thread type that fits your marker
Highly recommended product (if you're not using a Halo).