I have experience with both... Primary arms is a good company to deal with. Installing my trigger required that I remove and re-install the right side bolt release. A PIA but it all worked out. I believe this was mentioned somewhere else on the forum. I like the trigger, way better than the factory model. Two stage takes a little getting used to. I have a single stage CMC on my 300 AAC. I'll screw up when switching if I'm not careful.