Prior to plans of a new build, I have only been a flip up BUIS user and would like to know what advantage a permanent co-witness gives, other than a seamless transition if your optic bugs down.
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Prior to plans of a new build, I have only been a flip up BUIS user and would like to know what advantage a permanent co-witness gives, other than a seamless transition if your optic bugs down.
Besides the easier transition, they are also less parts to break. Quite a few people have deployed various spring-loaded BUIS over the years only to find them stuck at half-mast for reasons relating to spring fatigue as well as gunk stuck in the sight gumming up the works.
A fixed rear BUIS is always there all the time. obviously the biggest downside is incompatibility with some optics and magnifiers.
Another incompatibility that could exist, could be with the user.
At one time I used the combination of CCH BUIS-EOTech-STD FSB. Regardless of how hard I concentrated on the target, hoping that all other objects in the FOV would fade out, the FOV was simply too cluttered for me. :(
I've had a few guys that come out and shoot with us complain of the cluttered view. I've never had one maintain that complaint after shooting with us for awhile.
I shoot an SBR with a T-1, fixed FSB, and a Larue rear BUIS. this is about as cluttered as you can get given the smaller tube size of the T-1 than other Aimpoints, or the Eotech "screen". In fact I shot this gun this past Tuesday night in our match. At no point did the iron sights even register on my brain, as I was using the optic correctly and focusing on the targets. In fact, when focusing on the target, I find it difficult to even register the iron sights, front or rear, at all.
(I need to work on more pictures of this phenomena)
However, the above setup with T-1 in Larue mount does provide for a lower 1/3 cowitness which may help. given how low that the Eotech sits when mounted directly to the flattop I could see a potential issue with fixed sights. IMHO the better fix there is to ditch the sub-par optic. YMMV
You’re correct Sir, I imagine with more time, I could have MADE myself get used to the set-up, but again maybe not. I think as individual as each of us are, so are the ways our eyes and brain gather and process this type of information.
For some it might be an easy process. For others it may take time. Or again, for some, overcoming the problem may never happen.
I kept telling myself to just get used to it. It’ll come with time. But since I had no need to force myself to get used to and adapt to this set-up, the choice was a simple one. Get rid of the CCH BUIS, and go with a folding BUIS.
I had a ARMS#40 BUIS and I swapped it out for a Larue fixed BUIS. The ARMS BUIS I had to adjust the windage 3/4 of the way to the right to zero it. The Larue fixed BUIS required less than 1/4 turn of the windage knob from center to zero it. [ Not a problem really but I thought that was nice that it zeroed up in the center of the sight]. Also picked up a Larue LT-150 aimpoint mount. I was worried at first about a cluttered sight pic but now I believe it will work out good once I get my aimpoint.
Sorry not much help but its my experience so far.
Thanks everyone. Will try shooting a bit more with my BUIS up to see how it feels and possibly, if I see myself getting used to it if it gets in the way.