Originally Posted by
a0cake
Saw a dude's castle nut back off on Sunday at the range. He said he built the rifle himself and was sure he did everything right. (He didn't stake the castle nut first of all). But the main problem was that he kept saying that he tightened it to 40 inch pounds. A small dose of logic would have indicated that the spec is 40 FOOT POUNDS on the castle nut. Unfortunately, Armalite's manual apparently has a typo and says INCH POUNDS also. I told him it was a typo and to tighten it to 38-40 foot pounds. Nope. He takes it to the gunsmith, who agrees with Armalite. He then re-torqued (if you can call 40 inch pounds torque) the castle nut to 40 inch pounds and smothered it in blue loctite. I immediately stopped caring and went back to shooting.
Foot pounds!