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Posted: 7/8/2006 5:35:31 AM EDT
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Tore down my AR 20 inch Flattop/bull to have the barrel recrowned and inspected. When I went to install, I was runing about 30 ft lbs on the barrel nut, after 3 sets of loosen and torque, I was not able to get my gas tube in. (then came 30 minutes of thinking about what to do.) Upping the torque wrench 10 ft lbs at a time, I went to the next hole. 90 ft lbs is where I ended. My a-hole was puckered up, but what am I to do? I though about waiting to get a new nut, but what fun is that. I did use the Brownells vice kit and did not jerk/torque anything. All threads were coated with TW25 Mil Com. When I put my forearm tube back on, naturally the sling stud did not line up, I locktited the last 2 treads on it to get it lined up. Any thoughts on the high torque? What would you have done? |
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Even though 90 ft lbs is higher than it "should" be, it probably won't be an issue. I usually tighten the nut by hand, then use the wrench to go to the next hole, never had an issue. There are shims available that can help with the problem as well. Randall at AR15barrels.com makes them I believe. I have used loctite on tubes before without issue as well. I have also used a set screw in the bottom of the tube into the barrel nut. If it was my own rifle, I would have just tightened the tube, re-drilled for a new sling stud and had an extra hole in the tube. |
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