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Posted: 11/21/2008 10:32:30 AM EDT
[Last Edit: 11/21/2008 10:54:48 AM EDT by redline]
Is it normal for a rear sight to have to be adjusted so far left from center to get a zero. It sure looks weird when i go to shoot it. I'm a left hander. Thanks again guys    
Link Posted: 11/21/2008 10:35:01 AM EDT
[Last Edit: 11/21/2008 10:35:40 AM EDT by AR-180]
That is common.  If your front sight base is canted, the rear sight looks like that.  I have one that is pegged to the left, and one is pegged to the right.  

Yours still has plenty of range for most conditions though.  Use a paint pen to mark the zero.

ETA:  With the way demand has gone up, I bet this gets even more common as builders rush to get stuff out the door.
Link Posted: 11/21/2008 10:35:36 AM EDT
Mine is the same way, and I have my doubts that it is correct. I also haven't zeroed it correctly yet.
Link Posted: 11/21/2008 10:51:47 AM EDT
Of course this is the only one that is like that i have. and yes it is my new colt 6920 and it is zeroed. Built June of 2008
Link Posted: 11/21/2008 10:54:55 AM EDT
You can see the fsb is definitely canted to the right.  But if you can get it zeroed, well zero is zero.
Link Posted: 11/21/2008 11:03:37 AM EDT
[Last Edit: 11/21/2008 11:11:04 AM EDT by Wespe]
That isn't bad at all, there is a reason they have adjustable sights.  It is nice if you only have to go a click or two to center your shots, but it is within spec if it zeroes.

You can see the fsb is definitely canted to the right. But if you can get it zeroed, well zero is zero


It looks canted to the right, but wouldn't that require the rear sight to be moved right instead of left to zero?
Link Posted: 11/21/2008 7:58:33 PM EDT
Don't know?.That seems like a long way off for a new gun. If it is the normal for these guns i will have to live with it. Sure wish it would be the one that is close to perfect. Thanks again
Link Posted: 11/21/2008 8:35:15 PM EDT
My new RRA A2 upper is way worse than that. It is almost maxed out to the right. I am sending it to RRA for repair next week. It shoots straight now, but its so far right it bothers me.
Link Posted: 11/21/2008 9:02:03 PM EDT
[Last Edit: 11/21/2008 9:03:00 PM EDT by redline]
I wonder how they will fix it? Maybe i will call colt again and tell them what is wrong or bothering me. They are already sending new hand guards and dust door. maybe they can help i will call again Monday and see what they say. I really hate to show people my new rifle and they say and it came like that Thanks
Link Posted: 11/21/2008 9:46:51 PM EDT


LMT ... sighted-in
Link Posted: 11/21/2008 10:15:52 PM EDT
I find it unacceptable. I can't understand how someone would accept this a A-OK.
Link Posted: 11/21/2008 11:59:06 PM EDT
Originally Posted By Wespe:
That isn't bad at all, there is a reason they have adjustable sights.  


Yep. Looks like 12 clicks Left.

I would buy that Colt in a second.
Link Posted: 11/22/2008 1:10:17 AM EDT
it's fine
Link Posted: 11/22/2008 4:23:23 AM EDT
[Last Edit: 11/22/2008 4:24:46 AM EDT by colorado_fatboy]
I wouldn't worry about it.

CLICK HERE for a thread on how to index barrel,  if you want to fix it.

Link Posted: 11/22/2008 4:37:47 AM EDT
[Last Edit: 11/22/2008 4:40:12 AM EDT by ChromeLined]
Its not canted the spec for military rifles is 10 clicks left or right windage to be accepted.If it was canted you would have windage adjustments in the17 18 19 click range or more.It could very well be a mis indexed barrel.If the FSB is canted this is a way to see.Turn the rifle upside down and see if it balances perfectly while its on a flat surface with the front and rear sight ears.

Try to push a piece of papaer under the front ears that will tell you if its sitting flush.The easiest way to make sure a barrel is straight is to shim the index pin in its receiver slot by using a half moon cut of aluminum from a soda or beer can that will shore it up nice and tight and will be perfectly straight.
Link Posted: 11/22/2008 5:04:54 AM EDT
Originally Posted By redline:
Of course this is the only one that is like that i have. and yes it is my new colt 6920 and it is zeroed. Built June of 2008


How did you decipher the serial number to get a build date especially as to month?Colt has only told me year unless I spend the $25 for the certification.
Link Posted: 11/22/2008 5:12:46 AM EDT
Originally Posted By Wespe:
It looks canted to the right, but wouldn't that require the rear sight to be moved right instead of left to zero?


Yes, the rear sight is moved in the direction of the cant.
Link Posted: 11/22/2008 5:12:51 AM EDT
If I remember correctly, your "in spec" up to three tick marks right or left.
Link Posted: 11/22/2008 5:16:26 AM EDT
[Last Edit: 11/22/2008 5:19:11 AM EDT by Brett_Walker]
Link Posted: 11/22/2008 5:19:19 AM EDT
Here is an excellent tutorial on this and other fixes.

http://www.ar15.com/forums/topic.html?b=3&f=4&t=226782

Hopefully my tools will be here today, so I can do my M&P15.
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