AR Sponsor
Posted: 3/20/2010 2:45:57 PM EDT
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OK, so I finally finished up my AR build by putting on a scope and mount. I just took her out in the back yard to do a preliminary sight in...Just to make it a little easier and quicker when I get to the range and shoot at further distances. I'm glad I didn't make a trip to the range and have this problem...
My point of impact on the target is about 5" low and my scopes adjustment is maxed out  I'm shooting at about 20 yards. I know bullets fly on a arc but even it does rise some out at 100 yds or so, I still don't have any adjusment on the scope to dial-in at longer distances. Besides, I don't think the arc has a rise of 5" anyway...
I've mounted many scopes on bolt actions rifles in the past and never had this issue. Any suggestion? Am I going to have to shim the thing somehow? I would really like to not have to do that. FWIW, here are the specs on the scope and mount: Bushnell Elite 3200 Tactical 5-15x40mm Wilson Combat one piece mount Any help would be greatly appreciated! Thanks! |
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This will save ammo... Remove the upper from the lower, remove the bolt. Place it on a table or something, find a way to support it so it can't move. I lay it on my sandbag front and rear rests. Place a target or better yet and white paper with a 2" black dot on it, use a black marker. Or find something to aim at 50 - 100 yards. Now look through the bore and line it up so the black circle is in the center. Support it so it doesn't move, and adjust your scope crosshairs on the circle, going back and forth from the bore to the scope until they match. This is what I do when I can't get to the range or it too ugly out. My neighbor has a ball on a lighting rod on his roof that is exactly 100 yards away. I use that. Are you sure you adjusted your scope correctly today? If it is hitting low...adjust the scope UP. And...bullets do not fly in an arc. They drop from the time they leave the barrel. The arc is from the bore being angled upward so the bullet will hit at your zeroed range. At 20 yards...remember the scope is well above the bore on a AR. Try a 50 or 100 yard zero. I doubt that you have a real problem. |
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Quoted:
This will save ammo... Remove the upper from the lower, remove the bolt. Place it on a table or something, find a way to support it so it can't move. I lay it on my sandbag front and rear rests. Place a target or better yet and white paper with a 2" black dot on it, use a black marker. Or find something to aim at 50 - 100 yards. Now look through the bore and line it up so the black circle is in the center. Support it so it doesn't move, and adjust your scope crosshairs on the circle, going back and forth from the bore to the scope until they match. This is what I do when I can't get to the range or it too ugly out. My neighbor has a ball on a lighting rod on his roof that is exactly 100 yards away. I use that. Are you sure you adjusted your scope correctly today? If it is hitting low...adjust the scope UP. And...bullets do not fly in an arc. They drop from the time they leave the barrel. The arc is from the bore being angled upward so the bullet will hit at your zeroed range. At 20 yards...remember the scope is well above the bore on a AR. Try a 50 or 100 yard zero. I doubt that you have a real problem. That's the method I use on bolt actions in the past. Pull the bolt and aim the bore at something in the distance, adjust the scope accordingly. It would get me on the paper consistently. I was on the paper with the first shot, the shot was low. I gradually adjusted ~UP~ on the scope turret and I kept getting closer. Soon my scope was maxed out in the UP position, my shot was closer to the bullseye but still about 5" low... |
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this might sound stupid, but is there any way that the mount could be on backwards? (front to rear, rear to front) I'm just wondering if the mount is thicker on one end than the other. Yeah, I thought of that. It's installed in the proper direction according to the pics on Wilson's website. |
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Quoted:
Quoted:
At 20 yards...remember the scope is well above the bore on a AR. Try a 50 or 100 yard zero. I doubt that you have a real problem. http://www.box.net/shared/static/tppqdkapak.jpg http://4-riders.com/pics/AR/100_yard_zero_01.jpg Oh my bad, man. I must have read over that part of your post. Thanks for the help and I will try moving the target out further! |
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So, I took the upper off the rifle today and peeked thru the barrel and aligned it up with something in the distance (about 50 yds). The scope adjusted to the object with no problem.
I'm still thinking I may buy a lower mount though. I know the closer to the bore, the better. Check out this pic and let me know what you think... 
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