Glock Talk
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10-10-2012, 16:31
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#1
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Senior Member
Join Date: Sep 2009
Location: U.S.A.
Posts: 13,468
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Anyone else require excessive left windage with Magpul flip-up rear sight?
Ok, I've now tried two different uppers (M&P carbine and PSA mid-length) and both require the rear Magpul sight to be moved over more than half way to the left. Originally I figured my M&P FSB was canted but now I'm not sure so sure. I don't have another rear sight to try.
Not a huge deal and I zeroed my new PSA upper just fine but I am a bit OCD.
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10-10-2012, 18:21
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#2
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Silver Membership
Senior Member
Join Date: Apr 2008
Location: Far West, USA
Posts: 7,153
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Its probable the front sight base is slightly canted. Typical PSA bs.
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10-10-2012, 19:32
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#3
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Who?
Join Date: May 2010
Location: NW Florida
Posts: 6,598
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Quote:
Originally Posted by Cole125
Its probable the front sight base is slightly canted. Typical PSA bs.
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He's having the same issue on two different uppers.
OP, sounds like the mating surface on the sight itself might be out of spec(assuming this is the same sight on both guns). Try a different rear sight of some kind and see if the problem carries over. I'm sure a local gun shop or range will have one you can try for a few minutes.
If it is the sight, I have no doubt that Magpul will make it right.
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Last edited by WoodenPlank; 10-10-2012 at 19:33..
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10-10-2012, 19:35
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#4
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Lifetime Membership
Senior Member
Join Date: Jun 2007
Location: NW Indiana
Posts: 3,128
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Quote:
Originally Posted by cowboy1964
Ok, I've now tried two different uppers (M&P carbine and PSA mid-length)
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Quote:
Originally Posted by Cole125
Its probable the front sight base is slightly canted. Typical PSA bs.
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Then that would also include typical S&W bs then, wouldn't it?
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OP, it happens, tolerance stacking between the FSB, the upper receiver, and the BUIS.
example of one of mine, It's not bad, probably looks worse with a MBUS since they are relatively "thick", so I think it makes it look worse than it really is.
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Last edited by mvician; 10-10-2012 at 19:37..
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10-10-2012, 19:57
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#5
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Ninja
Join Date: Jul 2006
Location: The Lone Star State
Posts: 401
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Experiencing the same thing with mine. Doesn't bother me too much, it's sighted in and I'll probably never adjust it again so no worries.
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10-11-2012, 01:33
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#6
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Silver Membership
Watcher.
Join Date: Jun 2007
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10-11-2012, 01:40
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#7
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aSun666
Join Date: Jul 2008
Location: Tempe, Arizona
Posts: 1,572
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I have a Troy battle sight that needed 27 clicks to the left on a BCM mid length. It happens.
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10-11-2012, 02:28
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#8
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CLM Number 281
NRA Life Member
Join Date: Nov 2005
Location: US
Posts: 27,817
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Listen to Mike,........... 
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10-11-2012, 03:32
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#9
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Head Sheepdog
Join Date: Jan 2001
Location: Buried in the X-files
Posts: 30,870
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Seen a guy with a factory new M16A2 require nearly a complete all the way right adjustment to zero.
Wasn't the gun, it was him. Because we mechanically zeroed the gun and I was 3 clicks left, another guy was about four clicks right.
Strange things happen.
Call MagPul.
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10-11-2012, 20:00
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#10
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Biggest Member
Join Date: Jul 2011
Location: NE Oklahoma
Posts: 2,555
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My magpul buis requires quite a bit of left windage also...I always just attributed it to tolerance stacking and that it was just how my gun was.
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10-11-2012, 20:24
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#11
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Sgt. USMC
Join Date: Dec 2007
Location: NAS Fort Worth JRB
Posts: 449
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Mine is about the same between multiple rifles using the MBUS or carry handle. It might just be the way you zero your rifle to you.
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10-11-2012, 20:53
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#12
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BRC #1492
Join Date: Sep 2011
Location: Kansas
Posts: 750
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My PSA upper with Magpul BUS is set at dead center. Guess just depends on the rifle as I've read many stories about having to adjust the sight far to the left to get it sighted in.
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10-12-2012, 03:21
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#13
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Senior Member
Join Date: Feb 2007
Location: In my shop
Posts: 5,119
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It is not an issue. Just sight it in and shoot it.
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