For an entirely different reason (I don't like the twang sound), I just today installed the JP Enterprises Silent Captured Spring assembly in my Sport II. I used the optional Tungsten weight to give the buffer the equivalent of an H-1 weight.
I already like the smoothness and the noise reduction when racking the bolt, it sounds like a solid gun now. I will get to the range next week to see how it performs.
I'll post again after I shoot it.
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