I have a JP in my JP, a Jewell in my A2 and a CMC in my 300BLK. They are all quite different. The JP is two stage but very refined. The Jewell is two stage, very adjustable, but I have it set to meet Service Rifle requirements in terms of weight. The CMC is single stage and snaps like a glass rod, it's the best of the three for target stuff.
Ray.
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