BUIS with Optics


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Old 07-23-2013, 02:05 PM   #1
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Default BUIS with Optics

I need help with the following situation. I have been slowly building my Ar15 which consists of a pre-ban Colt lower with a new 16" Stag upper. I would like to remove the rear sight/handle and replace it with a flip-up rear sight, eventually adding an aimpoint (co-witness). Now to my question. If don't replace the standard front FSB with a flip up will it always be in the way when I use the aimpoint. I don't mind changing it but will have to do more research (something to do with the gas block). Any help would be greatly appreciated, I have not ordered anything yet until I clear up this issue.



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Old 07-23-2013, 02:13 PM   #2
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It won't be in the way. Your front sight will co-witness with your Aimpoint. Some people (lik myself) prefer to not have a FSB when using an optic but it won't be in the way of your sight or field of vision.



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Old 07-23-2013, 03:10 PM   #3
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I would just get the Aimpoint and shoot with it. If you don't like the FSB in your sight picture, then change it out later. You will see it with a red dot, but its not really an issue.

Just remember to shoot with both eyes open.

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Old 07-23-2013, 04:10 PM   #4
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Same deal when using a scope with a FSP , you will never see it through the scope , red dot yes u will see it but its not a big deal you will be focusing on putting the dot on the target and will never think about the FSP being in the way . I thought much like you did when I first started doing this

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Old 07-23-2013, 08:51 PM   #5
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fixed front sight base is the best most solid sight system for the front there is. no downside to using it. a fixed front base that is correctly pinned in is more solid and secure than a removable gas block. anything that is strong enough to bend or shift a fixed front sight base will put the entire gun out of commission.

clamp on and set screw gas blocks can be easily shifted if left unprotected can deadline the gun with a little abuse.

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Old 07-23-2013, 08:56 PM   #6
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Quote:
Originally Posted by JonM View Post
fixed front sight base is the best most solid sight system for the front there is. no downside to using it. a fixed front base that is correctly pinned in is more solid and secure than a removable gas block. anything that is strong enough to bend or shift a fixed front sight base will put the entire gun out of commission.

clamp on and set screw gas blocks can be easily shifted if left unprotected can deadline the gun with a little abuse.
Jons right you beat the sh!t outta that front sight its not going any where or if bad enough the barrel will be bent , I have 3 that are pinned and 3 that are not all my SHTF go to guns are pinned FSPs , I have changed out a couple of the front sight pins in them for something smaller for a little better precision at longer distances but they are well protected
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Old 07-24-2013, 03:00 PM   #7
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Thanks to all the above posters, you have convinced me to keep the FSB. I will be purchasing a rear flip-up sight and when funds allow it I will also pick up an aimpoint. This forum has always come thru with answers to my questions which I am extremely thankful as I don't have anyone to ask for advice.

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Old 07-24-2013, 03:18 PM   #8
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wise way to go.

if you dont like it after you use it for a while you can always convert the fsb over to a gasblock get a ff tube and flip up front later rather than doing it now.

i think you will like how it works with cowitness or 1/3 cowitness.



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