Quoted: The only other option is to open up the slot in the reciever where the pin slides in. It only takes a couple thousands to move the front sight quite a bit.
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Actually the correct way is to adjust the slot like TheKill says here, and not start whacking the front sight base with a mallet. Geez, show a little finesse, guys.
And this only works of the fron tsight is canted to the right (when looking down the sights). Reason being, when you tighten the barrel nut it tends to turn the barrel clockwise, and keeps the pin tight to the left side of the recivier (when look at the frnt of it).
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Nope, it works both ways - left or right. But most people skip the next all important step. Fail to do this and the barrel will twist in the upper receiver to some random angle and you'll still end up with a canted FSB just like JRBL1A1. And that step is tightening up the receiver slot so the barrel won't turn while you crank down on the barrel nut.
The way you do that is with a punch and small hammer. I said small. You lightly peen down the threaded area on the upper right next to the barrel pin to tighten up the slot. I said lightly. We're talking teeny, tiny taps, not a Full Power Shot. And be sure to do it with the barrel in the upper so the barrel extension can act like a little anvil. Just like it only takes a few strokes with the file to visibly move the FSB over, it only takes a few light taps to tighten up the upper receiver notch on the barrel pin. Do it on one side or both as needed to bring the FSB up straight (as seen through the rear sight), and keep it from twisting while installing the barrel nut.
Easy, huh?