The detent should be fine. Make sure the two orings are holding it in properly. If you are using small bore paint in a large bore barrel, you will have more issues, especially if you are using a force fed hopper. Some aftermarket barrels are worst than others as well depending on the depth of the cut for the detent. You can compensate a bit by wrapping some tape around the barrel where the back knob is located on the detent. That will push it farther into the barrel and help stop the smaller paint from rolling past it.
Except for the Automag in front, its usually the man behind the equipment that counts.