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A question about AR gas blocks

Discussion in 'Rifle Discussion' started by Ironbar, Oct 22, 2015.

  1. Ironbar

    Ironbar Tigard, OR Well-Known Member

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    I've finally narrowed down my search for an AR upper, but I need some advice. Having a front sling swivel is a must-have. But it seems that all the uppers that come with the sling swivel have the standard AR front sight post. I'm trying to avoid this as I intend on scoping the rifle once it's put together.

    All the uppers without the front sight obviously have gas blocks, but none of them seem to have a mount for a swivel. All the aftermarket gas blocks that have a quad rail or low Picatinney rail run upwards of $70-80, and I'd have to buy the damned sling swivel on top of that. I find this too cost prohibitive.

    For those of you that have scoped your AR's, does the front sight interfere with your sight picture through the scope? Do you know of any inexpensive fixes for the gas block problem? :s0092:

    Help!
     
  2. Unka-Boo

    Unka-Boo Milwaukie Active Member

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    anything above 2 power you wont see the post....and you can always cut the sight off of the gas block, used to be a common thing to do for FF tubes before all the aftermarket blocks started showing up
     
  3. krivey

    krivey mcminnville oregon Active Member

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    You could run a rifle length quad rail and put a sling swivel at the end. When I ran a scope with a standard front sight I couldn't see the post but I did have a reduction in brightness. Almost like a shadow. You may not have a problem at all.
     
    ron likes this.
  4. Cameron72

    Cameron72 Harrington, WA Bronze Supporter Bronze Supporter

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    When your are all strapped in with the sling to fire your AR you may end up putting lateral pressure on your barrel so your shot may be off. That's why their are free float front tubes.
     
    ron likes this.
  5. Ironbar

    Ironbar Tigard, OR Well-Known Member

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    Well, I finally pulled the trigger so to speak. I've ordered all the parts and will begin the build when I get the needed armorers tools.

    I bought the Palmetto State Armory Magpul CTR lower build kit, a drop-in 3.5 lb trigger, and complete 20" HBAR A3 upper with Nitride barrel in 5.56. It will all be built on an Anderson stripped lower. I already have a scope and rings for it. I'll probably give it a couple more tweaks before I'm done, but I'm hoping this will give me a good all-around rifle for what I want it for!
     
  6. Boboclown

    Boboclown North Carolina Well-Known Member

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    Might need the vise block. And a vise if you don't have one already.

    Free float or not? Just curious.
     
  7. Ironbar

    Ironbar Tigard, OR Well-Known Member

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    Vise block is on the way. Didn't go with a free float but may in the future.
     
  8. ron

    ron Vancouver, Washington Silver Supporter Silver Supporter

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    The number one accuracy improvement for the AR is a
    free float tube. IMHO As stated in previously different
    sling tension can make a big difference at the target.
    I like a set up with a low profile gas block and a free float
    tube passing over the gas block. Putting the sling swivel
    on the float tube. And a 'backup' flip up front sight on the
    end of the float tube. Yankee Hill Machine makes
    excellent float tubes, gas blocks and flip up sights. YHM
    products are well made and not too expensive.
     
    rick benjamin likes this.
  9. Boboclown

    Boboclown North Carolina Well-Known Member

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    This, sort of. With a non-free float handguard anything you do will affect point of impact. If you use a bipod, going from using a bipod and not using one eill change the point of impact. Or different pressure on the bipod each time will change it.

    It could be accurate without a free float handguard, but it won't be as consistent.
     
  10. Charliehorse

    Charliehorse Cascade Mts - State of Jefferson USA Well-Known Member

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    Absolutely agree.
     
  11. liquidsys

    liquidsys North Bend, WA Disciple of the Gun

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    I agree, except with your last sentence. At the end of the day, accuracy IS consistency. It doesn't matter if your rifle shoots 1" left, as long as it does it every single time.
     
    rick benjamin likes this.
  12. Boboclown

    Boboclown North Carolina Well-Known Member

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    But if it shoots right when going from bipod to offhand, but groups are the same, the POI isn't consistent. That's where the free float comes in. If free floated, the POI <should> (shooter's skill may vary) should remain consistent from using a bipod to not using it.

    I probably should have worded it better.
     
  13. liquidsys

    liquidsys North Bend, WA Disciple of the Gun

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    We're now saying the same thing Bobo :)

    Doesn't matter where the bullet hits, as long as it hits there every single time. That's accuracy. =)
    Without free floating, he'll have a hell of a time getting that consistency. Especially if he moves from bipod to tensioned sling to free hand and back again.
     
  14. Boboclown

    Boboclown North Carolina Well-Known Member

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    Pretty much, just didn't word it the way I should have.
     
  15. Ironbar

    Ironbar Tigard, OR Well-Known Member

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    Gentlemen, the point is moot. I purchased an upper with a standard front sight/gas block. I intend on using the rifle to its fullest potential. I am a rifleman not a bench rest shooter. My personal feeling is that bench rest shooting is lazy.

    Yeah, maybe all you're looking for is a day on the bench, shooting sub MOA groups. My preference is learning and keeping the skills needed to engage a 20 inch target out to the rifleman's quarter mile. We'll see what this rifle brings me in the way of accuracy. If it unacceptable then I'll consider upgrading to a free float handguard. For now, I'll make do with what I ordered and do the best I can with it.

    I'll post a range report when I get it all together.
     
    gundog10 and 808hondacrguy like this.
  16. Boboclown

    Boboclown North Carolina Well-Known Member

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    Well, I don't do bench shooting only. I just prefer consistency with the POI. Even changing your grip can affect it, however slight the change may be. I shoot off the bench off-season, so when my scope is sighted in I don't want to have to sight it in again.
     
  17. ron

    ron Vancouver, Washington Silver Supporter Silver Supporter

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    As a rifleman I have learned the importance of using the sling
    for stability. Yesterday I shot a High Power Rifle match. Using
    a 20 inch AR 'Service Rifle' with iron sights slung in the prone position at 600 yards. The use of sling is fundamental to a
    steady shooting position. An AR with free float hand guard is imperative. Varying sling tension will greatly degrade accuracy without the floated front hand guard.
     
    rick benjamin likes this.
  18. liquidsys

    liquidsys North Bend, WA Disciple of the Gun

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    This is basically exactly the point I was trying to make earlier. Your example illustrates it a little better, I think.
     
  19. Lance Jacobs

    Lance Jacobs South Willamette Valley Oregon Well-Known Member

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    .

    Surely there must be some local gunsmiths here in Oregon, who could do this sort of work? Shipping out of state for something so minor as this would seem like a waste.

    I would have to think that there must be someone available in the Willamette Valley that could help with such minor AR work. I used to know a gunsmith in Eugene who could handle small work like this, but he has unfortunately retired.

    .
     
  20. Lance Jacobs

    Lance Jacobs South Willamette Valley Oregon Well-Known Member

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    Yes, I read every letter of every word that you wrote.

    I don't think that he has to go to a website for a company in Ohio. There surely must be some local gunsmiths or companies that could handle doing this.

    .