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I dont know if this is the place to post this but. This is a perfect piece. When he says .750....he means .750 not .751 but .750. I had to turn .005 off my barrel to make it work, I assumed these would fit like half of the other AR parts out there....sloppy. I was wrong. Great machining, fast service perfect product. I have been waiting for something better than the JP block and this is it. I can shoot my 220's sub, flip the knob and shoot my 125's supersonic and still retain the 1/2 inch groups at 100 yrds!!
Matt in Moscow
(might half to order a spare knob to play with)
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