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Posted: 11/18/2004 8:45:02 AM EDT
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I have an ARMS #40 mounted on my Bushmaster 11.5" weapon. I was at the range today attempting to zero it. I had to crank it all the way to the right to get anywhere near center of target. I had a similar problem with the exact same sight on my previous Bushmaster 11.5" that I had with my previous company. When I was in the Army, I never had to make that gross of a windage adjustment, so I don't think it's poor sight alignment. Has anyone else had similar issues? The body of the sight looks centered on the rail. I am truly baffled. Stony |
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Same deal with my 16" LMT upper. The LaRue Aimpoint, ARMS19s, ARMS40A that I own all cant to the left on the before mentioned upper. This is probably the rail's fault and not the mounts' or it could be due to tolerance stacking. It took me 12 clicks to the right to get me to zero @ 50yds with the #40A. The LMT BUIS that I'm using does not cant, and was spot on with 2-3 clicks to the right @ 50yds for an IBZ. My intention was to use the LMT anyways, as my #40 coexists with the 19s & Compact ACOG on a different upper. -Jim PS, nevermind. I misread and interpreted that your sight was offcenter to the left on the rail. |
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As long as it zeros, what's your complaint???? I have 2 #40s and one's off one way and the other is off in the opposite direction, but both zero fine when adjusted. Different uppers have slightly different rails/flat-top, even tho they both have mil-spec rails, a mount/sight on one doesn't always mean it'll be zeroed when switched to another A3 upper, re-zeroing is SOP, when swaps occur. Same with BUIS...... As long as your POI goes where ya aim and the sight zeros, ya got no problem. Mike |
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The problem you guys are describing is due to a slight misalignment between the upper receiver and the barrel assembly, causing the front sight block to be tilted slightly. This happens when the barrel nut is being torqued down and the barrel is allowed to rotate slightly with the nut. For folks at home, rebarreling tools (vice, barrel wrench, punch to remove gas tube pin, moly lube) will fix it in a minute or two, but for guys in the military, it's an armorer's fix. -Troy |
I'll bet its the sight. I've seen more than a few with the same issue. If the weapon runs, dont mess with the barrel. If you can get some loctite, and aluminum foil make some shims to put in one side of the site which will bring it over for you. I understand how important a back up sight is, but on a 11.5" upper isnt "good enough" sufficient? Come on you sissy, listen to Senator Feinstein you don’t need sights; just spray an pray, it is a maching gun.  BTW, I assume the functional issues are now taken care of with the shorty? |
Not in my case. |
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