Posted on 04/08/2013 9:31:57 AM PDT by hdbc
I recently bought a DPMS AR15 from a dealer. I have not been able to fire more than one round out of this rifle before it jams. Yesterday, a round got stuck in the barrel. I've tried using different mags, limited to 15 in NJ and using Federal .223 ammo. I've taken the gun apart and lubricated it with M-Pro 7. Any ideas what could be wrong with this gun before I send it back to DPMS?
Do you mean a cartridge got jammed in the chamber?
What happens when it jams? Is it failing to extract, or eject?
Around got stuck in the chamber?Did you use a chamber brush before attempting to fire the weapon?
Stuck in the barrel? Is it a chrome lined barrel?
There are some sites with good technical information - I might suggest www.ar15.com for a look at their technical forums. However, if you are not comfortable fixing it yourself any competent gunsmith can probably diagnose and fix the problem fairly quickly.
Get your micrometer and measure the ammo. Check it against specs.
How old is the ammo and who manufactured it?
Is the chamber bright and shiny clean?
I just got a DPMS that works well. Admittedly, there are some questions about the efficacy of their quality control. Might want to make sure the gas tube is in there properly and there are no obstructions in the gas hole on top the barrel or in the gas block. Sounds to me more like the thing isn’t cycling.
Also, if the round only goes part-way down the barrel, that indicates the problem is possibly the ammo. My favorite ammo is the PMC stuff, but also CBC/Magtech is good.
No, it was a hangfire in the barrel. The range officer pushed it out of the barrel from the muzzle end. That was the first time that that happened. I cannot get this rifle to fire more than one round before it jams.
A picture of the brass that got stuck will tells us a lot. As it is, it could be any number of things.
Stuck/broken extractor. Spring missing from under extractor. Bad ejector or ejector spring. Gas system not fully cycling. Improper buffer or buffer spring installed causing a short stroke condition. Cracked gas tube.
Need more info.
I don’t care for DPMS for many of the same problems.
I have a DPMS, Sig, and a Windham CDI. In order of quality, it’s Windham, Sig, then FAR, FAR below DPMS.
I was having failure-to-feed on the DPMS, and realized it’s very finicky about mags. The metal one that came with it just didn’t work, and I switched to one of my Magpul, which decreased the issue markedly, but it still happens.
Plan on unloading it.
Look on the lower and barrel and see if it is rated for. 223 only or 5.56. Shooting the former in the latter can cause problems. (The reverse is fine though.)
Inspect the extractor and spring for damage and serviceability.
I was told DPMS stood for Didn’t Pass Military Specs
If you had a squib, that’s the ammo’s fault. If the rifle was damaged clearing the squib, you should be able to verify that as well. Make sure the gas tube still lines up with the gas key on the BCG. Make sure the other end is still seated correctly in the gas block.
And check your bolt face for any problems there. Particularly the extractor and ejector pin.
Try an extra power spring for the extractor and/or an Oring over the same spring. Previous poster suggesting AR15.com is a good start, also search for fte and ftf with ar15s. My experience is the extractor is a good place to start.
Now, that is truly a single shot rifle and should receive congressional approval any time now......................
I have a DPMS I bought in 1999. It’s been a flawless rifle for me. 20” superbull barrel 1:8 5.56. After a JP trigger upgrade, she’s a 1/4 MOA rifle.
You have it exactly reversed.
5.56 has higher pressure than .223.
You can safely fire .223 in 5.56, but not the opposite.
That being said, lots of people do it anyway.
.223 Wylde will fire both. The throat length is a compromise between the two.
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