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Posted: 11/27/2006 2:55:13 PM EDT
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Have you double checked the scope to make sure its not loose in the mount? Checked to make sure the mount is not loose on the receiver? I know you said it is, but just being repetitious. You do know that you can adjust how tight the Larue levers are correct? Also, what kind of rail system are you using? Who installed it and who installed your barrel? |
How tight did you torque the barrel to? If the scope is solid inthe mount, the mount is solid in the receiver, the barrel is free floated.... only things I can think of is that the barrel is not in the receiver tight enough, there is a problem with the scope, something is amiss with the barrel itself, or its shooter error. Do you have another rifle you can put the scope on and see if you can get consistent groups with it? Could be a loose/shifting reticule in the scope. |
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The accuracy you groups exhibit are no typical of my Recon barrel. As stated above there are a lot of variables. Assembly, the uppers, ammo, scope and scope mounting. The strings appear to be mainly vertical which my be an over-torqued or under torqued barrel. I do not warrant accuracy on uppers built by others than myself. I had an upper sent to me a couple of months ago where the guy was unhappy with the groupings. I reinstalled the barrel and it shot great. I will be happy to disassemble the upper and check it out and reassemble and test fire it. There is a fee that would just amount to the time spent to sort it out. I would not need the entire rifle. Just the complete upper and scope. Before that I would suggest you try some top of the line ammo such as Federal Match 68 or 75 grain Match. Also try that scope on another rifle that is known to be a good shooter just to remove the scope variable before we both get into a lot of work and $$$ to make sure that Nikon is not defective. Ammo plays a huge part in the accuracy equation. Denny |
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Black - X, I noticed you're in KY. If you happen to be near KCR I'd be happy to help. If we're locals drop me an Email through here and we'll see if we can't figure it out and save you the time and expense of shipping it to Denny. I doubt it's a barrel issue. I'd guess assembly and/or shooter error. with assembly being the most likely. let me know if I can help. luv |
| I understand how a barrel that is undertorqued could cause grouping issues. Can someone explain how a barrel that is overtorqued would cause accuracy issues? I recall Coldblue making some comments about this, but was wondering if someone could explain the mechanics of it. |
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I'm not trying to piss in anyone's soup, but I'm going to play Devil's Advocate. It very well may be an assembly error, but as noted, practically all of those groups exhibit vertical stringing. This is commonly a sign of improper breathing, or a lack of consistency while breathing. I'm not trying to say that you're no good at shooting. Just maybe you had a bad trip to the range or two. We all have bad days at the range from time to time, at least I certainly do. |
| Try the Recon without the bipod, use sandbags or similar instead. Inconsistent pressure on the rifle, especially using a bipod, can lead to some very severe vertical stringing. Bipods tend to bounce a bit on hard surfaces, so you'll have to keep them in check with the sling. |
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I had a simialr problem a couple of weeks ago. Built up a 6.8, got it sighted in just fine, deer hunted with it a few days, and then one morning after I got out of the woods I decided to do some shooting with it. My groups were off to the right a bit, I adjusted the scope, and it was fine, hunted a couple more days, and shot it again, this time they were right and high. I need to say that the groups were nice and tight, as opposed to yours stringing. Each time I corrected and it was fine..........for a while. Contacted Leupold, and they had me send the scope in for them to look at. Nikon has a good warranty, but remember the Buckmaster line is made in the Philippines, like Burris's Fullfield II's. At any rate, should it be the optics, they should take pretty good care of you. |
You don't say...  I have a buddy who recently had a build done by Denny with one of his barrels, he wasn't too sure if the cost of his AR build was worth it (being his first one). Now he won't shut up about how he can ding the steel waaaaay downrange all day. |
Very True |
Yep. I'm thinking the bipod is resting directly on a firm surface like a wooden or concrete shooting bench. Lose the bipod and support the rifle with a rolled up sleeping bag or something and I'll bet those groups tighten up. |
| A technique that works with bipods on hard surface benches is to clamp a stop the the bench, such as a 1x2. Set the feet of the bipod behind the stop and push the gun forward hard enough to get a little spring tension in the bipod legs. The bounce will go away and the groups should tighten up. Works on hard ground too by digging the feet in slightly. |
Typically when I install a LaRue rail I have found that there is not a lot of room for variation when it comes to tightening the barrel nut. How do you adjust the torque when the only option with the barrel nut and receiver combo is either hand tight or within spec? After the spec position there is no way to adjust the barrel nut to line up with further torque. |
You should see the number of fucked up self assembled uppers I work on every year. Trust me it can be done. Not saying that is the case here, but I do have to unfuckulate quite a few. Some times, as professionals, we acturally use mills and lathes to get things to time up properly. Just hanging off the barrel wrench is not the correct way to get your gas tube to line up. I have had to replace a few receivers that the guy just had to get to the next hole. Some twist to where you can't even get a charging handle to run up and down them, let alone the bolt carriers. Others are just plaing split. Denny |
LMAO!! and another new word for my lexicon!! P.S> your "Operator" barrel rocks!! |
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