Uneven rails? Help

Discussion in 'AR-15 Discussion' started by clyderay44, Jan 30, 2013.

  1. clyderay44

    clyderay44 New Member

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    I have recently purchased a set of 45 degree offset buis, I had to purchase a rail to add to my stock hand guard as well. The rail I added is noticeably higher than the main rail on the receiver. What problems could this cause? I am unable to zero my buis, with windage adjusted all the way it is still shooting 6 inches left at 50 yards. Could this be the problem?
     

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  2. mountainman13

    mountainman13 New Member

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    That certainly isn't going to help your situation. I'd look into a riser for the rear sight if I couldn't afford a new handguard. Personally, that handguard would drive me bonkers.
     

  3. hoovco

    hoovco New Member

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    You need to have those on the same sight plane. The rails need to be the same height.
     
  4. clyderay44

    clyderay44 New Member

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    I had thought about a riser for the back sight but it would compromise my main optic. The way I see it, the only option other than a new hand guard would be raising the back sight. Is this correct?
     

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  5. hoovco

    hoovco New Member

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    Yeah. I would just get a new handguard.
     
  6. purehavoc

    purehavoc New Member

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    yes those handguards do move when hit hard enough even though it may seem tight right now ,you need a free float hand guard to do what your trying to do the right way
     
  7. clyderay44

    clyderay44 New Member

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    Ok, when I purchase a new hand guard should I go aluminum or polymer?
     
  8. Quentin

    Quentin New Member

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    Those are M4 handguards so they're pretty fat. Whatever you buy has to fit tight or the front sight will be flopping around. My MOE plastic handguards lock on the delta ring very tight but I wouldn't trust them for a front sight.

    ETA:

    Actually that whole arrangement is a nightmare. Have you thought about just going with flip up sights and cowitness with the optic? You wouldn't need to replace the handguard then. I believe YHM and Bushmaster sell a folding front sight that works with that style gas block.
     
    Last edited: Jan 30, 2013
  9. hoovco

    hoovco New Member

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    I've never been a fan of putting any kind of aiming apparatus on plastic, or hand guard that's not attached to the barrel nut. If you want front sights, they should be attached to a gas block, or a rail that isn't going to move.

    I personally would go with a FF hand guard that locks into/ onto the barrel nut for the most stable platform.

    When you put your front BUIS on your stock hand guard, you lose some sight radius too. With a FF hand guard, you can stretch that radius out a bit. I love putting 15" rails on 18" barrels and 12" guards on 14.5" barrels just for that. Plus it looks pretty rad.

    That's just me though, other people on here may have different thoughts.
     
  10. purehavoc

    purehavoc New Member

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    Like this configuration , your going to have $100 + or - in the good quality FF hand guard but you should be able to run your pop up rear sight right thru your red dot and do away with the 45 deg sights . #1 they are a PITA and seem to get hung up on stuff , #2 It doesnt feel right to me when I put that angle out there with irons , red dot no biggy on the angle but I dont like the irons like that .

    [​IMG]
     
    Last edited: Jan 30, 2013
  11. John_Deer

    John_Deer New Member

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    Personally I would just go with a plain jane rear sight. If the optic fails, you know where the rear sight was attached to the gun. Just dump the optic and put the rear sight back on the gun. That whole set up or the cowitness jobs, bayonet lugs and so on are vine catchers. I can't make it a half mile into the woods with any of that with out getting the urge to call someone to bring a hacksaw or whatever is needed to get that garbage off my gun.
     
  12. clyderay44

    clyderay44 New Member

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    Ok, sorry about that guys. This is my first black rifle and I have put a lot of rounds through it with the red dot I was just thinking of other options with buis. Would any front flip up iron sight fit on my flattop gas block? I am a newb to this so be patient with me. Thanks
     
  13. hoovco

    hoovco New Member

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    It looks like you don't have a rail on your gas block. With the current set up you have, you're not going to be able to mount a sight on there.

    If you get a picatinny gas block, just make sure that your sights are for the sight plane your gas block sits at.
     
  14. Quentin

    Quentin New Member

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    OP, I guess you missed this the first time. Again, check and see if the YHM gas block folding sight will clamp down over your gas block. If so, it might be the best front sight option. Or see what the maker recommends.
     
  15. clyderay44

    clyderay44 New Member

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    Quentin, thank you I checked and Yankee Hill makes a part on the Bushmaster website that is made exactly for this problem. Thanks