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Posted: 2/2/2017 4:22:11 PM EDT
[#1]
Oops double tap.
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Posted: 2/2/2017 4:25:14 PM EDT
[#2]
Make sure your scope mount is tight, the rings and the base.
And you really really ought to use some type of rest, trying to zero a scope free hand is a good way to chase your shots around in circles. Sorry, I'm a little unclear on the optics...have you only tried the "new upper" with that particular scope? Inspect the upper for any deficiencies, for instance I've seen a brand spanking new from the factory Bushmaster with a loose barrel nut. The gun was cycling even thought the barrel was practically falling out. ETA: I'm not bashing your choice in optics but there are a few much better opions out there in the same price range than that Centerpoint at least from the one sample of Centerpoint I've used. |
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Posted: 2/2/2017 4:35:11 PM EDT
[#3]
Who made the barrel?
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Posted: 2/2/2017 5:10:47 PM EDT
[#4]
Quote HistoryQuoted:
Make sure your scope mount is tight, the rings and the base. And you really really ought to use some type of rest, trying to zero a scope free hand is a good way to chase your shots around in circles. Sorry, I'm a little unclear on the optics...have you only tried the "new upper" with that particular scope? Inspect the upper for any deficiencies, for instance I've seen a brand spanking new from the factory Bushmaster with a loose barrel nut. The gun was cycling even thought the barrel was practically falling out. ETA: I'm not bashing your choice in optics but there are a few much better opions out there in the same price range than that Centerpoint at least from the one sample of Centerpoint I've used. Scope and rings are tight. Not completely freehand, using a bipod. Three other rifles I put together can knock the ~1/2" center out of a Shoot-N-C at the same distance, or longer. Two of those rifles are using an UTG scope, as is this one now. The new upper with the new UTG scope - all over the place. The older upper with the new UTG scope - all in the black of the 5-1/2" Shoot-N-C. Another asked who made the barrel - Not sure. No name is immediately obvious unless it's under the hand guard. |
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Posted: 2/2/2017 5:13:54 PM EDT
[#5]
Quote HistoryQuoted:
Who made the barrel? Not sure, as it's not immediately obvious...... unless it's under the hand guard. Where is that usually found? |
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Posted: 2/2/2017 6:22:29 PM EDT
[#6]
Might be under handguard.
Can you post pics? Pull off the handguards and check the barrel nut.... |
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Posted: 2/2/2017 7:09:25 PM EDT
[#7]
Quote HistoryQuoted:
Might be under handguard. Can you post pics? Pull off the handguards and check the barrel nut.... Honestly, that was one of the things I was going to check. Just haven't done it yet. I have a barrel nut wrench, but no |
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Posted: 2/2/2017 8:03:39 PM EDT
[#8]
The thing with barrels is the difference between a match grade high end and a run of the mill cheap one isn't going to be noticable at 50 yards without a rest.
Not quite sure what the OP's definition of "all over the place" is but likely it is something more than a cheap barrel. Things to look for----- Lose barrel nut Flash hider mounted off center or crooked causing bullet strikes. Something real bad with rifling , should be visiable if you look . As others have said, lose scope mount. Something should be pretty funky as ARs,even those with off the shelf bargin price parts tend to shoot decent unless something is clearly lose or really cobbed together |
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Posted: 2/2/2017 8:11:18 PM EDT
[#9]
Quote HistoryQuoted:
Might be under handguard. Can you post pics? Pull off the handguards and check the barrel nut.... Your barrel nut isn't tight (torqued to at least 30+ foot pounds) would be my first guess. Since you put it together so long ago you may have only slapped it together to see how it fit. Cheap Chinese red dots and scopes are absolute junk. I have seen new Sightmark scopes that were broken when new in-the-box. They couldn't be zeroed no matter how hard you try. UTG and any of the other Chinese brands are something I would give to a child as a toy. They are not good enough for use on a firearm. You are better off using irons than anything made in China. |
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Posted: 2/2/2017 10:26:24 PM EDT
[#10]
Quote HistoryQuoted:
Your barrel nut isn't tight (torqued to at least 30+ foot pounds) would be my first guess. Since you put it together so long ago you may have only slapped it together to see how it fit. Cheap Chinese red dots and scopes are absolute junk. I have seen new Sightmark scopes that were broken when new in-the-box. They couldn't be zeroed no matter how hard you try. UTG and any of the other Chinese brands are something I would give to a child as a toy. They are not good enough for use on a firearm. You are better off using irons than anything made in China. I bought the upper pre-assembled from one of the bigger suppliers. I've been very happy with the UTG scopes I have. This was on a 100yd. range, 7.62 x 39 AR, UTG scope, bipod. 
When you get up in the 70's, you're not as steady as you used to be. :-( |
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Posted: 2/2/2017 10:33:31 PM EDT
[#11]
Quote HistoryQuoted:
The thing with barrels is the difference between a match grade high end and a run of the mill cheap one isn't going to be noticable at 50 yards without a rest. Not quite sure what the OP's definition of "all over the place" is but likely it is something more than a cheap barrel. Things to look for----- Lose barrel nut Flash hider mounted off center or crooked causing bullet strikes. Something real bad with rifling , should be visiable if you look . As others have said, lose scope mount. Something should be pretty funky as ARs,even those with off the shelf bargin price parts tend to shoot decent unless something is clearly lose or really cobbed together "All over the place" had a few rounds in the 5-1/2" Shoot-N-C, few on the 11x17 backing I had them stuck to, and the rest who-knows-where. Rifling looks okay. Could see nothing weird about it. Did look at the hider and could not see where anything was hitting it. I will look at the barrel nut tomorrow. |
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Posted: 2/3/2017 2:08:40 AM EDT
[#12]
Man, my Stag shoots like that at 50 yards off the bench with sandbags. Changed my upper to a .450 bushmaster and it clover leafs at 75 - 100 yards. Changed multiple ammo brands and weights and still horrible grouping. I'm just gonna change the barrel. Hopefully you can pull tighter groups with a simple fix. Good luck.
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Posted: 2/3/2017 12:37:23 PM EDT
[#13]
There are many things that can effect accuracy. Start with a thorough cleaning of the inside of the barrel using a good solvent and bore brush, as this will allow you to loosen any packing or machining oils that may be present. Then with a cleaning rod and jag, push some cotton flannel patches soaked in denatured alcohol through the barrel, as the denatured alcohol will remove any oil, solvent, or grease, and keep pushing denatured alcohol soaked patches through until they come out clean. If you have traditional 2-piece handguards, remove them and try rotating the barrel nut, it you thing it may possibly be loose, then fixture the upper and re-torque and index the barrel (Min 30-ft lbs). As already mentioned, check to make sure the flash hider or muzzle brake is mounted correctly and not off center with the bore. I would suggest the next time you go to the range, to also take along the scope you have on your 7.62x39 rifle, and try it on this problematic upper, just to see if it works any better just for process of elimination of any possible optic or mounting problems. Then you don't mention the ammunition that you are shooting, I would suggest trying a few different types of Quality USA Made Ammunition from reputable manufacturers, keeping in mind that there is a huge difference between a match grade ammunition like Federal Gold Medal Match and plinking ammunition, and sometimes it may be bullet weight that effects performance, it is also bullet shape of how much bullet actually has contact with the rifling that can also perform differently, so again try several different types of ammunition and you find that this upper may like one particular load as compared to others.
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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Posted: 2/3/2017 12:59:59 PM EDT
[#14]
I've decided to wait before doing anything further on my questionable 5.56 upper to try and figure out what's going on. If I'm going to need to start dissecting the thing, I might as well do it with the correct tools so I don't fook something up. Already have a couple variations of barrel nut wrenchs, pin punches, etc., but I just put an Action Block and Armorer's Bench Block on order. We'll dive back into it once that stuff gets here. In the interim, thank you all for the suggestions and will update this thread as we proceed.
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Posted: 2/3/2017 4:59:08 PM EDT
[#15]
What weight bullets are you shooting?
Are both the uppers using a barrel with the same rate of twist? |
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Posted: 2/10/2017 5:49:02 PM EDT
[#16]
To answer the last question..... been shooting 62gn. Lake City and Privi Partizan.
And the update: Could not detect any barrel manufacturer identifier; no markings that I could find… which is a little disturbing. The flash hider is not in the way and deflecting the rounds. The barrel nut is tight. How tight? Dunno, but it still wasn’t budging approaching 50 ft. lbs. Frustrating that I couldn’t find anything obvious with the rifle itself. Put it back together with the EO Tech I had on the other upper, and will use it as the “house gun” until I have time to really spend some quality time with it. Nekked: 
Flash hider view of things: 
Going back together: 
Think I'll have a beer...................... |
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Posted: 2/10/2017 8:24:40 PM EDT
[#17]
Get rid of that riser and mount your EOTech directly to the rail. Who makes that thing? "Famous Maker" is the English translation for the Chinese saying of "piece of shit". That, I believe is the problem.
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Posted: 2/10/2017 8:48:24 PM EDT
[#18]
Quote HistoryQuoted:
Get rid of that riser and mount your EOTech directly to the rail. Who makes that thing? "Famous Maker" is the English translation for the Chinese saying of "piece of shit". That, I believe is the problem. That riser has only been mounted with the EO Tech on the the other AR's upper that shoots fine with the scope. I have not used it on this "bad" upper. This is getting convoluted and the gist of the issue is getting lost in my feeble attempt to make things more clear. Thanks all - we'll figure it out. |
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Posted: 2/13/2017 11:39:39 AM EDT
[#19]
Quote HistoryQuoted:
That riser has only been mounted with the EO Tech on the the other AR's upper that shoots fine with the scope. I have not used it on this "bad" upper. This is getting convoluted and the gist of the issue is getting lost in my feeble attempt to make things more clear. Thanks all - we'll figure it out. Sorry you're having bad luck with your rifle OP. Glad your health issues have gotten better..good shooting with the 7.62x39 by the way. |
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