Gas block/fsb question

This is a discussion on Gas block/fsb question within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; Ok so I have a bushmaster orc, which is a flat top with a milled low profile gas block. Currently the only sights on this ...

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Thread: Gas block/fsb question

  1. #1
    Member Array mr. orange's Avatar
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    Gas block/fsb question

    Ok so I have a bushmaster orc, which is a flat top with a milled low profile gas block. Currently the only sights on this rifle is the eotech 512 I have installed. All I want to do is to have a gunsmith replace the current gas block w/ a standard m16/ar front sight base. Now my gunsmith tells me that this will not be possible without using a raiser on my eotech. I then asked about f-marked fsb's, he still says the eotech dot will be in the middle of the sight base. He then suggested that I get a railed gas block and use flip up sights for front and rear. This completely defeats the purpose as I plan to co witness the front sight at all times and more than likely keep the rear buis up all the time.

    Anyways, any thoughts or ideas?
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    VIP Member Array dukalmighty's Avatar
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    All my guns with flat tops and eotechs the dot sits on top of the front sight pin not in the middle,so the FSB is not in the way.As far as using the
    Eotech and iron sights at the same time I think defeats the purpose since the iron sights are in case your eotech fails or you have it turned off IMHO
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    Member Array mr. orange's Avatar
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    Quote Originally Posted by dukalmighty View Post
    As far as using the
    Eotech and iron sights at the same time I think defeats the purpose since the iron sights are in case your eotech fails or you have it turned off IMHO
    Exactly, I don't want to have flip ip the irons if the optic fails at a less than opportune time.
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    JT
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    I have a standard fixed FSB, and I don't even notice it when I use my EOTech.
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    VIP Member Array Blackeagle's Avatar
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    By default, an EOTech on a flat top with a fixed FSB will cowitness in the middle of the scope. If you want a lower cowitness, get a QD mount for the EOTech.

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