Anyone ever have to send a DPMS upper back to them for warranty work or evaluation? I am having severe accuracy issues with mine (5 inch groups scoped at 100 yards). I used a known good scope, and tried several manufacturers cartridges including PMC 55gr, Fiocchi 62gr, Hornady V-Max 55gr, ADCOM M855 55gr, Lake City M193, green tip (not sure of the military designation), and Winchester 55gr fmj. The upper is attached to a Rock River lower and fits together very well. I have about 350 rounds through it so far. I am just completely frustrated with this setup and don't know where to go from here. A 2-3 MOA group would be satisfactory being that it is the M4 pattern rifle. Any ideas?
DPMS warranty
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Sir, I would remove the scope to eliminate it as the source of the problem and shoot that upper with iron sights if you can, if not try another scope.
Flat top upper? What type of mount? Can you post pics of your setup?
That rifle should shoot much better than that.
Flat top upper? What type of mount? Can you post pics of your setup?
That rifle should shoot much better than that.
It is a flat top upper and I am using XTR extra high rings. The rings are torqued to the upper at 65 inch lbs and the caps are at 20 inch lbs. I have shot it with iron sights also and the results are basically the same.
Here is a picture to the rifle:
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DPMS complete upper on a Rock River complete lower
Here is a picture of the target with a 20 round string shooting slow fire:
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Here is a picture to the rifle:
DPMS complete upper on a Rock River complete lower
Here is a picture of the target with a 20 round string shooting slow fire:
...O.L.
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I'm sure you already know this but if you're shooting from the bipod and your barrel isn't floating, subtle changes in pressure as you press the rifle down to stabilize it will be transferred directly to the barrel and that would be true whether you're using the scope or iron sights. A clue is that your sample target shows a horizontal grouping within your expectations; it's the vertical dispersion that's a problem.
You might also check DPMS's own forums to see if others are experiencing similar problems with similar rifles and how they handled it (that worked for me).
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Slinging up tight can also cause that but would likely add some horizontal displacement, too. I ran into that issue with a bipod and the solution was to float the barrel. Normally, that involves a degree of disassembly I wasn't about to try (and forget about any warranty). My solution was this because it replaced the standard handguard but only attached to the rifle at the rear, thus floating the barrel.
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I agree it's not cheap, but it's the only one I know of that doesn't require removal of the sight and gas block but still works. Perhaps shooting from a bag would ease the pressure on the barrel enough to at least eliminate any barrel flex from the equation. I've been following the DPMS 7.62 forum and people have been complaining about many things, including barrels so it could just be their upper.
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It shouldn't matter in practice but are they aware that the upper is not on a DPMS lower? Manufacturers can get touchy about such things.
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I don't think it would affect accuracy either, especially with the tight fit you have, but it might affect their willingness to do any extensive parts replacement, especially if they pop it on one of their own lowers, put it in a test stand, and it seems to behave reasonably well.
For instance, you know how touchy they can be about shooting handloads, even if that couldn't cause the problem at hand. Same thing.
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My experience getting service from anybody by e-mail is pretty dismal; if you really want them to respond, call them.
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+100, get 'em on the horn.GI6
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Very good advice. My DPMS carbine will shoot 10 shot sub 3" groups at 100 yards with surplus 55g ball ammunition and Federal M193 using iron sights. Your rifle should do as well or better. The first thing I would check is good cheek weld while using a scope on your rifle. I shot my Colt HBAR better using iron sights than using a scope mounted on it. Turns out I had inconsistent stock weld.
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do let us know how they take care of you , they have some very good folks in the shop and a pretty good guy in the troubleshooting department
I got called yesterday by DPMS' customer service. He said they have my rifle waiting to test fire and give it a diagnosis. They couldn't do it cause it was 35 below and windy. I don't blame them for waiting for warmer weather. They are keeping me in the loop through the process and I appreciate that.
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