using a BUIS as my only sight on an AR?


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MAKster
April 28, 2007, 12:49 PM
I'm thinking of buying an AR with a flat top and the A.R.M.S. #40 flip up rear sight. Since it will take me a while to save up for a red dot sight, will using the A.R.M.S. as my only sight be functional. What sight adjustments would I be able to make with a detachable A2 carry handle that I won't be able to make with the A.R.M.S? It appears that the A.R.M.S. does not have a dial for elevation, but just has fixed short range and long range apertures. How much accuracy will I lose? Thanks

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wdlsguy
April 28, 2007, 12:57 PM
The ARMS #40 adjusts for windage. Your front sight should adjust for elevation.

Gustav
April 28, 2007, 01:06 PM
You may also want to check out Yankee Hill Manufacturing and GG&G.

DMK
April 28, 2007, 01:52 PM
The ARMS #40 is good sight. I have two of them and love them. The YHM flip sight's (http://www.yankeehillmachine.com/store/sights.html) good too. I also have one of them.

Just zero the small aperture at 50 yards and forget about it. That will give you approximately a 250m zero on the small aperture and a 100m zero on the large ghost ring. I'm doing on my M16A1 clone (early M16s had no elevation adjustment on the rear sight). It gives you +/- 2" all the way out to 275 meters or so. That's well within the relative accuracy of most practice ammo.

If you prefer the same zero for both apertures, XS Sight Systems (http://www.xssights.com) makes a Same Plane aperture (http://www.brownells.com/aspx/ns/store/ProductDetail.aspx?p=51&title=AR-15%2fM16+HIGH+VISIBILITY+SIGHT) that will fit an ARMS #40 or any AR sight.

Bartholomew Roberts
April 28, 2007, 03:21 PM
I'd follow DMK's advice. Get a same plane aperture and zero at 50yds and you'll be good to go out to 225yds or so (depends on ammo, barrel length). Hold about 8" high on the target and you can hit reliably out to 300yds as well.

The elevation wheel comes in handy once you start shooting beyond 300yds; but most people have trouble even seeing the target with irons at that range.

Jack19
April 28, 2007, 08:06 PM
I use a LaRue BUIS as my primary rear sight. Works just fine. And there are no knobs to accidentally whack.

http://stores.homestead.com/Laruetactical/catalog/buisbig.jpg

cslinger
April 28, 2007, 08:09 PM
Damn that Larue looks like it has armor plating and belongs on the front of a destroyer or something. My guess is you could whack the hell out of it with a BPH and not lose zero. :neener: :what:

Risasi
April 28, 2007, 08:50 PM
The only thing I hate about the ARMS #40 is the fact that you can't fold the sight down when it's set to the large ghost ring aperture. (or is it the small aperture :confused: )

DMK
April 28, 2007, 11:43 PM
The only thing I hate about the ARMS #40 is the fact that you can't fold the sight down when it's set to the large ghost ring aperture. (or is it the small aperture )Yes, that's a good point, you can't lock down the ARMS until you flip it back to the close range/low light ghost ring.

The YHM sight can be flipped down regardless of which aperture you're using, but it does not lock down (which may be a good thing depending on how you look at it)

Chuck R.
April 29, 2007, 12:45 AM
I use Troy on mine, as a matter of fact I was out shooting with it today to verify my 100 yard zero after co-witnessing with my TriPower.

http://www.troyind.com/shop/images/rearsight_black.jpg

It's a little more than the ARMS, but I think it has a lower profile folded. One feature I really like is the absence of a windage knob, it's got the old A1 style wheel with detent.

Once I'm zero'd I leave the windage alone.

Chuck

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