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Unfortunately for me, I did not get around to testing this product out for about 6 months. I bought it to use with a muzzle break that requires 1/2x28 threads. My muzzle device threads on fine, thread protector threads on, but this jam nut will NOT go on. I suspect this may be the nut for 9mm ar’s put in the wrong package, or the threads are not cut deep enough. Very disappointed for the cost. I could have gotten a 5 pack from Amazon for this price. I expected Optics Planet to ship quality and correct parts. Roll the dice elsewhere, or check immediately.
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