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I have 5 of these, 3 on AR15s and 2 on AR10s. All fit well and function great. I have tried some of the others that fix to the existing bolt latch, but have had problems with clearance. The Phase 5 product fits great and doesn't interfere with the operation of the firearm.
I run a 6.8 oz in my service rifle with fast heavy loads. I was using a Tubb weight that inserted into the back of the bolt carrier, but you had to pull both pins to open the the the upper as it made the bolt carrier a little longer. Since the 6.8 is on long back order I had to get one from HeavyBuffers recently to use with my MagPul Gen II UBR stock.