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Posted: 3/2/2008 6:38:45 AM EDT
| I could not decide where to post this, but thought I would post it here since it's an A1 sight, and because I like it here. I was trying to laser boresight my new SBR, and found that the optic was pretty close to the laser dot, but the irons were WAY off. The windage was fine, but the laser dot is about level with the bottom of the "U" formed by the FSB. I thought it could have been because I might have had an "F" type FSB, but the difference in height between "F" FSB's and standard ones is only 0.040". The difference in my case is more like 1/4". Maybe I'm just an idiot, but I simply can't figure out why it is so far off. It's not like I can screw in the front sight post to get it into alignment. Any ideas? |
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We got a few A2s we have for the students that have the windage cranked way off ot one side or the other. I think the last time they had their barrel changed, the people that did it might have done it wrong and causes this problem. Anyways, we get students in the class that figure it should be centered and will start cranking on them. Never mind that they are probably way over to one side because the last person to fire them found this out too. So now with a close zero way off, they come out to the range and their first rounds aren't even on the paper. The solution I use might also help you in that it's old-fashioned bore sighting. At 25 meters, I pull out the bolt and center the target in the middle of the barrel. When it's centered I carefully move up to the sights and see where it's at. I adjust the sights to be on target when the target is in the center of the barrel and that at least puts them fairly close on paper. Now I know my method is similar to the laser method you've been using but I've never been fond of the new gimicks so you might want to try this method and see if that will put you on target. |
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Also, do the full length A1 uppers have their zero affected dramatically by pressure on different areas of the forearm/ barrel? A few weeks ago I sighted my A1 in off the bech and when I shot it off hand it shot about 6 inches lower at 100 yards wiht the same ammo. My 16 inch CAR-A4 from RRA does not have this problem. |
Thanks for all the input. JoeBud had it right. I never used a laser boresighter before, so was pointing it at things too close. Now comes the fun part - shooting it! I hope I can make some time this week. |
The E1/A1 upper I recently got came like that, read sight all the way to the left. When I finished putting the rifle together, I centered it. When I was done sighting it in, it was all the way back to the left. It's a 1967 MP 12 barrel and whoever put it together didn't center the FSB well enough. |
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This is the second thread I have read in a week where people were going nuts because their sights were all carnked over/down due to a laser boresighter, but they hadn't shot live ammo through it. I think the lesson here is get you rifle, get some ammo, start at 25 meters and work the sights until you are centered... |
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