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Posted: 7/11/2004 6:38:47 AM EDT
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Hi, I own a DPMS Lite 16 . Ive had it for about 2 years now and shot well over 1000 rounds without a single problem until reciently. I have been shooting wolf ammo through it, and after the first 10 or 15 rounds thats when the trouble starts. It will extract the spent round with no problem but it wont bring the new round in. After checking this out I noticed on the round it tried to bring in there was a scratch all the way up the caseing where it tried to grab it, but it just didnt bring it in the chamber. Ive tried several mags and I have the same problem with all of them. What could be causing this to happen. Any help would be appreciated Thanks. PS I clean this rifle after every trip to the range, but have done nothing to the gas tube. |
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Short stroking. Something is keeping the action from cycling normally. First of all, in my experience, DPMS ARs are made pretty tight. My Classic A2 has about 6,000 rds thru it. At 1,000 rds yours is just starting to break in. 1. Gas rings. Have all three? All intact? Do you lube them before firing? I found my DPMS chrome carrier ate up one and a half rings at about 2,000 rounds. The replacement set I put in has done much better. Buy a couple of sets for spares, they're inexpensive ($3 - $5 / set) but crucial to the proper op of an AR. 2. Bolt cam pin. Sometimes when my DPMS gets dry/dirty, a couple of drops of CLP on the cam pin race in the carrier is all it needs. Wolf ammo is the coolest and dirtiest round of all that I fire, I have had the same thing happen to me, maybe twice, and was using Wolf both times. There may be other possibilities, but those are the ones I have run into with my DPMS. |
Give the chamber a serious cleaning and be sure you're lubing to the -10 and see if that doesn't correct the problem... |
Do they have a link for these one-piece gas rings? Also, how long are these one-piece gas rings good for? Thanks. kc P.S. Has anyone here had experience with these? What are your thoughts on these? |
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And my guess is that the Muffler throw-out Bearing is shot and needs to be replaced. NOT!!!!!!!!!!!!
Alrightly then, This means that you are pulling the buffer every time and fully cleaning the receiver extension, the buffer spring, and the buffer, then reinserting them back into the rifle with a thin coat of CLP. You are using a 30 cal mop with solvent spun in the chamber to get the last cut of chamber clear of fouling. When re-installing the parts, you are applying a coat of CLP to all the bearing parts. And, you have included pulling the mags apart and cleaning all the fouling out of the bodies, the springs and the followers. Point blank, if you can get the rifle to run with 10 rounds of Wolf without problems, then everything is OK. The problem is that you are running the rifle too dry (lack of lube-CLP). Your problem can be solved with nothing more than a Can of CLP (BreakfreeCLP) to correctly lube the rifle. When the rifle is lubed correctly, the B/C moves back with authority. When the buffer limits out, it gives the rifle a little jolt. This jolt will assist the mag/mag spring in getting the top round fully up to the lips if there is a binding problem with the mag. When the B/C becomes sluggish due to binding or fouling (lack of lube) the impact of the buffer is lessened (speed of B/C), which translates to less of a jolt, and the buffer not fully stalling the buffer and allowing the mag to get the top round up fully (time wise with a weak spring). P.S. When running Wolf ammo, run the upper bearing surfaces a little more wetter with CLP to deal with the triple base gunpowder fouling, and the powderized case fouling (poly/lacquer scrapped from the case) that gets scrapped off the case during loading. Around the 300 round mark, slightly open the bolt and give one of the gas exhausts ports a shot of CLP. This will transfer the New CLP to the gas chamber and from there is will migrate through out the upper needed surfaces to re-lube them. |
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