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Posted: 6/20/2015 11:31:36 PM EDT
| Is seasoning the receiver threads (tighten and loosening the barrel nut three times) necessary? |
| Tighten/loosen helps smooth out the finish on both the upper's threads and the inside threads of the barrel nut. It also helps distribute the grease throughout the threads on both parts. While I'm sure thousands of rifles have been built without doing this, it's a "best practice," and it's called for in the TM (and in Colt's manuals, IIRC). |
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It delivers a more accurate torque setting when tightening the barrel nut. Said torque being 30 pounds minimum, to 85 maximum, indicated on a torque wrench attached to a barrel nut wrench. Which is to say a 55 pound spread that isn't absolutely accurate per scientific procedure.
Yeah, knock the burrs off and you get at least the minimum necessary to keep the nut from backing off and twisting the gas tube. Or, a few extra thousandths to turn past that last tooth. It's not rocket science. |
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Quoted:
Yes. You can feel a difference in the nut the second and third time. BTW, I don't use a torque wrench. The amount of torque involved is not enough to warrant it. A nice snug feel by hand is plenty good enough IMO. Now, tightening bolts on reciprocating engine heads and crankshafts to an precise amount, that's a different story. - CW |
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