Dust cover malfunction.

What type of ammo are you using? If its lower powered, like Wolf is reported to be, it may be that the resistance offered by the dust cover is just enough to cause the problem. Its my understanding that many AR makers oversize the gas port so the guns will cycle with cheap ammo but maybe this is one that isnt? Heavy lube might help.

I'd recommend shooting it more. I had to put about 60 rounds through mine before it would cycle properly. It may just need to break itself in a little.

The spent casing might be rebounding off of the dust cover and attempting to rechamber. Are you getting a double feed?

How easy does the dust cover open and close? Fairly new uppers and new covers start out pretty stiff, but after numerous opening and closing it all starts to loosen up. Could be that it just needs to be broken in more.

Seems Nate snuck in there before me, but yea I do have to agree on more break in required.

I want to say its double feeding one goes partially in and the other is stuck either a stovepipe or otherwise. And again the dust cover flips up instead of down but i dont know if this is the cause.

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I would say that the casing is actually rebounding off of the dust cover back into the ejection port. If it doesn't stop after some breaking in, a call to Stag might be in order. Otherwise, just might have to start shooting with the dust cover open to begin with.

With no rounds loaded - does your bolt carrier open the dust cover in both the forward and rearward motions?

Is the spring holding the cover down and open after the cover is released from the closed position?

Is the spring holding the cover down and open after the cover is released from the closed position?

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With his left-handed model, the dustcover flips upwards, not downwards. If it was to flip downwards it would interfere with the bolt catch

Oops - thanks, shoulda just said... open with spring tension. Does the carrier open it in either direction and does it remain open with spring tension.

Thanks All'round for the clarification.

On the subject of the spring, I'd give it a visual once over looking for anything out of place. Kink, twist, poor spring pressure, etc.

Do you happen to have a spare dust cover assembly?? You could swap them out and see if the problem continues, if it does you know that its not the cover, if it stops, well the cover is the issue

My friend has a Stag model 3L. His dust cover works fine. I actually shot his and made my own Stag model 1 with their A2 complete lower and their model 1H complete upper. Good luck with yours.

NYH1.

beehlebf said:

I have a stag ar 15 left handed model. The dust cover flips up and is obviously on the left side. The gun has less than 10 shots and has been well cleaned and oiled. Every shot with the cover down the gun has jammed every one open and it ejects fine. Is this because it flips up the springs are tight and i should expect to shoot it open?

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Your particular ammo makes the gun under gassed and the extra force needed to open the dust cover apparently slows the bolt speed enough to cause your problem. Try some xm193 or 855. A full power 5.56 load is what the rifle is designed to use. After a hundred rounds or so it should cycle easier and run on the lower pressure ammo.

I'm not gettin' the responses relative to ammo. The door should be opened by the passing of the carrier not the spent shell. Again, does your door or does your door not get opened by the carrier and if it does, is it held securely in the opened position by the spring?

I have one of the LH models (3L, IIRC). Never had any issues with this. Granted, I only have the cover closed on the first shot of any session, but never had an issue with it. Keep shooting it, and if you keep having the issue after 500 rounds or so, contact Stag. That, or just leave the dang thing open.

Have the same Stag...have never had the issue with any ammo; shooting wolf, PMC, Remington, AE, 223 or 5.56.

It sounds like you just might need a new dust cover spring. Contact Stag and I'm sure they'll send you a new one. If for some reason they don't, midwayusa has them for $2

I think we all agree that the dust cover should flip open as the BCG passes. So, the question is, does it flip open when you use the charging handle? If so, open it that way and then stop closing it between shots. There's no reason to repeatedly close it unless you're taking a shot and then moving to a new shooting position.

QUOTE:""Your particular ammo makes the gun under gassed and the extra force needed to open the dust cover apparently slows the bolt speed enough to cause your problem. Try some xm193 or 855. A full power 5.56 load is what the rifle is designed to use. After a hundred rounds or so it should cycle easier and run on the lower pressure ammo.""

"MAKE SURE" your rifle says 5.56mm before you do what he said. If you have an AR thats only chambered for .223REM that advice wont work.
Also, are you firing that weapon supported by the magazine?

The ammo has nothing to do with the dust door coming open, because the BCG is what opens it. To prove it, unload the weapon, close the dust door, and then pull the charging handle back. When you do that, the dust door should open. If the BCG doesn't cause the door to open, the rifle is defective.

Talk to Stag, they have a lifetime warranty. If its bad they will repair or replace.