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Old 02-07-2010, 15:20   #1
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DPMS 308 jamming problem

I just took my brand new DPMS 308 out for it's first range session. The rifle shoots great groups but jams every time I get to the next to the last round in the mag. Both new mags came with the rifle. It doesn't matter if I only put 5 rounds or load all 19, it still jams on the next to last round. Anyone else have a problem with DPMS mags?
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Old 02-08-2010, 04:34   #2
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No experience with DPMS mags, but it sounds like the follower is either binding up or you've got a problem with the spring. Disassemble the mag and see if there's anything that would cause the mag to get caught up and try to remove, or file/sand down that area of the follower. You could also try replacing the spring.

Since you stated the rifle is new, you should be able to take it back for a replacement mag. New equipment SHOULD be fully functional out of the box.

Good luck and happy shooting!
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Old 02-08-2010, 06:33   #3
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Call DPMS. You will get someone on the phone and they will answer your question. I'm guessing it's a mag problem though. Also, what type of ammo are you using?

My .308 AP4 hasn't had any problems.
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Old 02-08-2010, 09:33   #4
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Hey sgte5 did you pull the mags apart and clean & lube befor shooting? I allways do this with new mags, you never know what's going to be in them.... Also take a good look at the brass to see if it's marked up. You can tell a lot about the chamber, bolt, and the mags by looking at the brass for scuffing, scratches, dings&pings ect...... Figure out whats making them and you can elimenate problems quick.
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Old 02-08-2010, 09:51   #5
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Originally Posted by rutro View Post
Hey sgte5 did you pull the mags apart and clean & lube befor shooting? I allways do this with new mags, you never know what's going to be in them.... Also take a good look at the brass to see if it's marked up. You can tell a lot about the chamber, bolt, and the mags by looking at the brass for scuffing, scratches, dings&pings ect...... Figure out whats making them and you can elimenate problems quick.
Good points here. This reminds me, I needed to put a couple layers of electrical tape on my AP4's case deflector. It would make a huge dent in the middle of the case on almost every round.
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Old 02-08-2010, 12:20   #6
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I talked to a rep at DPMS this morning. He stated they have been getting some reports of the same problem from others. He told me to send them in and they would fix the problem. I'm going to send them back after I receive the Magpul mags I ordered. I have to have something to use until they get here. I would tear them apart, but they are brand new and should function as such. Thanks for the replies and advise.
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Old 02-09-2010, 03:42   #7
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pull your mags apart clean the insides of the mag body well with a rag isopropyl alcohol there might be some packing grease or other crud in the mag that dont need to be there. then take the follower and inspect for flashing or other abnormalities. If theres any flashing on the follower use an exacto knife or razor blade and carefully remove. put the mag back together and go shoot if the problem continues send them back to DPMS
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Old 02-20-2010, 05:06   #8
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Originally Posted by sgte5 View Post
I talked to a rep at DPMS this morning. He stated they have been getting some reports of the same problem from others. He told me to send them in and they would fix the problem. I'm going to send them back after I receive the Magpul mags I ordered. I have to have something to use until they get here. I would tear them apart, but they are brand new and should function as such. Thanks for the replies and advise.
Slosh them around in a gallon of paint thinner to wash out any foreigh matter . Let dry .


Soak then in tranny fluid to lube . Let drain . Wipe off .

Give them a try .

God bless
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Old 02-20-2010, 08:01   #9
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Originally Posted by sgte5 View Post
I talked to a rep at DPMS this morning. He stated they have been getting some reports of the same problem from others. He told me to send them in and they would fix the problem. I'm going to send them back after I receive the Magpul mags I ordered. I have to have something to use until they get here. I would tear them apart, but they are brand new and should function as such. Thanks for the replies and advise.
Considering that you're in western WI and DPMS HQ is in St.Cloud MN, sending them in isn't that bad of an idea. I'd plan an afternoon in the cities and just drop them off, maybe ask for a tour....

Magpul makes LR308 mags? Let us know how those work for ya.

Last edited by SevenMM; 02-20-2010 at 12:33.
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Old 02-20-2010, 12:31   #10
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Originally Posted by WyrTwister View Post
Slosh them around in a gallon of paint thinner to wash out any foreigh matter . Let dry .


Soak then in tranny fluid to lube . Let drain . Wipe off .

Give them a try .

God bless
Wyr
Better to disassemble and get a visual of what the problem is IMHO. You don't want to soak mag's in lubricant (unless you're storing them for a long period) because it act's like a dirt/debris magnet. If you do soak the mag with lube the inside should be wiped out as not to attract dirt/sand in the field.
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Old 02-20-2010, 16:02   #11
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Originally Posted by Metalhead View Post
Better to disassemble and get a visual of what the problem is IMHO. You don't want to soak mag's in lubricant (unless you're storing them for a long period) because it act's like a dirt/debris magnet. If you do soak the mag with lube the inside should be wiped out as not to attract dirt/sand in the field.

thats right magazines are designed to operate dry.. take them apart visually inspect and clean with rubbing alcohol allow it to dry and reassemble dont do anything else........
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Old 02-20-2010, 16:28   #12
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Originally Posted by Metalhead View Post
Better to disassemble and get a visual of what the problem is IMHO. You don't want to soak mag's in lubricant (unless you're storing them for a long period) because it act's like a dirt/debris magnet. If you do soak the mag with lube the inside should be wiped out as not to attract dirt/sand in the field.



If they work when lubed , It gives the person a point of information at a relatively low cost and in a non invasive manner ( that should not void a warranty ) .

If they then work , he can take them apart and wipe them down . Depending on climate , a thin film of oil on metal is not necessarily a bad thing .

I live in a dry climate , so it is not as critical . It is also dusty , here . But my stuff mostly stays inside .

I am too old and fat to go to war .

God bless
Wyr

Last edited by WyrTwister; 02-22-2010 at 06:21.
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Old 02-22-2010, 06:07   #13
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Originally Posted by sgte5 View Post
I just took my brand new DPMS 308 out for it's first range session. The rifle shoots great groups but jams every time I get to the next to the last round in the mag. Both new mags came with the rifle. It doesn't matter if I only put 5 rounds or load all 19, it still jams on the next to last round. Anyone else have a problem with DPMS mags?
What is the weight of your rifle empty? I've never held one of these and am curious about the weight.
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Old 02-22-2010, 06:37   #14
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The only other thing I can think of on this is that he might be using reloads and the bullets are working themselves to a greater OAL from recoil.

I know this is a common problem with big bore revolvers.....
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Old 02-22-2010, 07:55   #15
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Every DPMS factory mag I've used, I've had to make the following mod to get them to run 100%



I purchased 10 of the LR-20 PMags when they came out for $18 each and have yet to have a single failure yet.

The first 200 rounds, I also had to have the BCG dripping w/lube. After that initial break in, I haven't had a problem.
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Old 03-01-2010, 16:32   #16
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Talshiar, the rifle weighs in at 9.65 lbs dry. Not something an old man, like me, wants to lug around all day. Most of my shooting is from a bench so I like the extra weight. It shoots nearly as well as my rem 700, that is built for bench rest. I think once I get used to it, and maybe a decent cheek rest, it will inprove a lot.
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