Help me shoot my ar straight

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Thread: Help me shoot my ar straight

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    Member Array tommyp's Avatar
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    Help me shoot my ar straight

    So a friend of a friend builds ar's. I have a 16 inch match grade stainless steel wilson barrel on it, with a sms stripped lower and decent guts. For some reason, the windage on the rear sight has to be pegged all the way over to the right to get it on target. Gun pulls hard left. Tried swapping out the irons, and it still needs to be pegged right. Any ideas?

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    Distinguished Member Array Tally XD's Avatar
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    Quote Originally Posted by tommyp View Post
    So a friend of a friend builds ar's. I have a 16 inch match grade stainless steel wilson barrel on it, with a sms stripped lower and decent guts. For some reason, the windage on the rear sight has to be pegged all the way over to the right to get it on target. Gun pulls hard left. Tried swapping out the irons, and it still needs to be pegged right. Any ideas?
    What type of front sight does it have? Is it pinned or is it a combination gas block/front sight? Sounds like the front sight needs to be moved so that the rear sight can be more centered.
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    Distinguished Member Array kapnketel's Avatar
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    Do you have an optic you can try? It may allow you to see if the front sight is off with the cowitness after you zero in the optic.
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    Member Array tommyp's Avatar
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    It has a gas block w/four rails. Front iron sight connects to it similar the rear does, and it's not windage adjustable from what I can tell. I tried throwing my buddies bushnell scope on it, but I couldn't get the elevation right to get the barrel on target.

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    VIP Member Array Cuda66's Avatar
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    Sounds like the gas block is canted.

    Get it into a steady rest, verify the the receiver is level, an then check if your gas block is level. Odds are, it's canted to the left.
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    Crazy question...I'm no rifle armorer....but is the barrel square to the upper? It might be a barrel installation issue....???
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    Quote Originally Posted by SIGguy229 View Post
    Crazy question...I'm no rifle armorer....but is the barrel square to the upper? It might be a barrel installation issue....???
    The AR-15 barrel is notched with a "key" that fits into a slot on the upper receiver. You really cannot put the barrel on but one way. What can happen though is the gas port, that is drilled into the barrel, could be drilled out of perfect index. When you align the gas block to this gas port it may not be in perfect alignment. When you mount the front sight, which is also your gas block, it may be "canted" off to one side slightly. This will cause you to have to adjust the rear sight windage off to one side or the other to compensate.

    There is some small amount of "tolerance" to the front gas block and you should have enough room to move it enough to get it more centered along the center line of the barrel.

    One way to check it is if you had a laser sight that mounts to the upper receiver rail like a regular scope. With low mounts it should be low enough to where the laser beam could actually intersect with the front sight post. Using this laser you could then adjust your front sight/gas block to the laser which would put it where it should be then you could adjust your rear iron sight correctly.
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    Ex Member Array Ram Rod's Avatar
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    Quote Originally Posted by Cuda66 View Post
    Sounds like the gas block is canted.

    Get it into a steady rest, verify the the receiver is level, an then check if your gas block is level. Odds are, it's canted to the left.
    Exactly what I'm thinking. Several years ago I had bought a brand new Bushmaster that I couldn't get to hit paper at all at 25yd. Sent it back and they fixed the problem......front sight/gas block indexed wrong.

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    Member Array tommyp's Avatar
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    i handed it off to the guy that built it for me just after I posted this. the gas block did seem to have some carbon / black build up outside it - maybe it's not aligned properly. I"ll give him a few days, and if he doesn't have an answer for me yet I'll give him a call and suggest checking the gas block. Thanks guys!

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    Member Array tommyp's Avatar
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    Got the gun back - gas block was loose and a little off - you guys were right on the money. Haven't gotten out with it yet, but I expect good results. Thanks!

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    VIP Member Array dukalmighty's Avatar
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    I just use the BFH method,adjusting sight alignment for generations
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    Member Array tommyp's Avatar
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    haha-I used that method to get my iron/porcelain bath tub out of my house (in 2-3 pieces), but something tells me it may not be the best option for sight alignment.

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    VIP Member Array dukalmighty's Avatar
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    When I was a cop in the 80's we were issued S&W 681 357 magnums w/4" bbl,they were fixed sight guns and the way you adjusted POI was the armorer had a couple tools,he would rest the frame in one kinda like a vise,and then he wold ask where the bullets were hitting and whack the barrel in the opposite direction to adjust windage and elevation,I believe 1 whack per inch of adjustment
    "Outside of the killings, Washington has one of the lowest crime rates in the country,"
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    Ouch!
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