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1/25/2018 7:38:29 AM
Posted: 12/29/2005 8:28:24 AM EST
I am now using a EoTech on my RRA FlatTop (mid-length). While it is a great sight, I still want a BUIS so I could change to iron sight when necessary. I am now pretty interested in a Troy rear BUIS (My RRA has a fixed front sight), and hear many good things about it.

However, I saw in some forums that when using the Troy rear BUIS, you have to get a higher front sight post instead of the normal one come with the rifle since the center of the rear peep hole on the Troy is higher that on a detachable A3 handle, and the normal front sight post may not be high enough to get a proper sight zero, is this true? If so, I will buy a higher post together with the Troy rear BUIS.

Does anyone have any experience with the YHM flip-up rear BUIS, I also hear good things about them, and the price is also attractive.


Link Posted: 12/29/2005 10:43:02 AM EST
All BUIS have the same standard height.
Link Posted: 12/29/2005 11:34:08 AM EST

I'm researching the same thing you are, and I've learned that while all BUISs use the same height, they are also all too tall for a standard FSB. This is apparently one of the reasons for having an "F" marked FSB.

I own a LaRue BUIS and plan on sighting it in with my normal FSB to understand how far off I will be. If it is a problem to zero my rifle, I will purchase the taller front sight post to correct the issue.

I'm told the difference is only 0.040", but I don't know how that translates at @ a 100 yard zero.

Good luck,
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