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Posted: 1/13/2007 5:45:14 PM EDT
| The other day I went to the shooting range to zero the rifle in at 50 yards, but the windages knob is all the way to the left and it still is a good 1.5' off of being centered. It appears that the front and rear sights are inline with each other. Could the barrel be bent. Any help will be appreciated. |
could be, or it could be your technique. you might be fliching a bit and pulling it off to one side. |
1.5' ??? or 1.5"(inches). If it is 1.5" off I would suggest returning it to the builder for adjustment. If it is 1.5' off at 50 yards after full sight adjustment I would suggest putting the bayonet on and using it as a spear 
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You said it is still 1.5' (feet!) off-center @ 50 yards. If you really mean feet and not inches, bore site it via eyeball @ 25yds. Pull the carrier (or bolt) and put it on sandbags. Wiggle it around until you are roughly on the bullseye when looking through the bore. Adjust your sight until it is also roughly on the bullseye. You should be "on the paper". If you cannot adjust the sight to the bore, then you need to check for something bent or misaligned. If you meant inches this won't help. |
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Yes I used the receiver block to tighten it, The upper reciever is some cheap o one i picked up at a gun show . I believe it is a A2 uppers its the carring handle is permently attatched to it. Standard A2 Front Sight Base Is there a way to tell if the barrel is bent with out taking it to a gun smith? |
From the tacked thread:
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thank you all I will take your advice and try thoes tips. One more thing I had forgoten to say, I knocked out the take down pins in the front sight and twisted it to the right and place the bore laser in the barrel and I had gotten it to line up. So fileing the receiver notch open more to the right would fix it? |
that could work for small adjustments. If you rotate the barrel too far, the bolt lugs will not line up with the receiver extension. You could also buy a new front sight base that uses set screws to hold it in place instead of the cross pins. Then you could set it where you want it before tightening down - use red loctite, let it get on the barrel and screws and degrease before use. I think Fulton Armory has these bases, others might also. |
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Rule of thumb is if you cannot get the rifle sighted in with the aputure in rear sight housing even pegged to one side, then the barrel is not going to re-index in the upper and still allow the barrel extension lugs to be indexed to allow the bolt lugs to enter/exit the extension cleanly. At this point, you need to pull the barrel and check the alignment of the barrel extension pin to the FSB. Since you have the FSB taper pins pulled, then this will allow you to pull the FSB forward and check the extension pin against the FSB as well. If the pin, the barrel gas port, and the FSB are all in line, then you either have a bent barrel or the upper barrel socket is screwed up. If the pin and gas port is aligned, but the FSB is off, then you have the option of making the FSB an adjustable unit, or Jig'g the FSB up where it belongs, and then re-drilling the FSB/barrel slots oversize for larger taper pins. Truth be told, if you have the option of sending the rifle/upper back to whom you bought it from, this would be the best bet. If not, then you have a project on your hands. |
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