That is what has me puzzled as well. I haven’t had the opportunity to go to the range yet and try some other stuff yet, but hopefully soon
Help with Short stroking rifle
- Thread starter Balzer94
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That is what has me puzzled as well. I haven’t had the opportunity to go to the range yet and try some other stuff yet, but hopefully soon
SKIP
Ultimate Member
High Power Competition shooting.
You have slow fire and rapid fire states.
Short strokes won't affect your score when shooting slow fire.
Jams and FTF will affect your score in a rapid fire state in which you have 60 seconds to shoot 10 rounds and a mag change. 2 mags. one with 2 rounds and the remaining in the second mag.
So I’ve fired of 59 rounds and they went with out issue. Round 60 did not lock the slide back on the magazine. Loaded up two rounds in to both magazines that I had used so far. Cycled the first round of each magazine fine. Failed to lock open on the last round for both of those magazines.
The first round out of my next mag of 30 just failed to feed the following round. This is utilizing a third magazine. (The first two were magpul, the third is hexmag)
This is that spent casing. It landed about five feet back and about 2 feet to the right. ( same for most cases)
The remaining 29 cycled fine and locked open on the bolt face
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The first round out of my next mag of 30 just failed to feed the following round. This is utilizing a third magazine. (The first two were magpul, the third is hexmag)
This is that spent casing. It landed about five feet back and about 2 feet to the right. ( same for most cases)
The remaining 29 cycled fine and locked open on the bolt face
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Still using 4198?
Yes, Same exact rounds that I had already loaded up before. Just trying to answer some of that questions that had been asked before.
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I still believe it is a gas volume issue with that powder since you have a short barrel and are using mid gas.
I’m just trying to wrap my head around why it is so sporadic. I would think if it were a volume of gas issue, which the reasoning behind makes sense, why isn’t it happening to every round, or atleast more than once or twice per magazine.
I’m also just trying to use up the rest of this ammo on this beautiful day. Haha
Well from experience, I have found that if I used Magpul mags on my 7.62x40WT which is mid gassed, the last round would not hold back the bolt but all the others worked fine. I tried an experiment and used one of my Vietnam issued aluminum mags and it worked every time. I deduced that somehow, the Magpul was putting more friction on the BCG on the last round. The problem is that I can't prove it but I can duplicate it every time. Try running a metal mag and see what happens.
I guess I’ll have to find me a metal mag. All I’ve ever had were the magpul, and a few hexmags. This most recent mag I had 4 failure to feed, and one failure to lock open at the end.
Brother, I havent read every response to this problem, but if there is a reliability issue with an AR the only was to diagnose it is with trusted FACTORY amm and ONE known good mag.....if you use reloads, or more than one mags....you can not narrow down an issue....otherwise you'll chase the issue in circles.....my 2 cents. Best of luck.
Here is one for ya. I just passed this upper around to 2 other lowers. Just to try. I put two rounds in to three magazines. And cycled them through the other lowers.
One of the lowers is from engage armament. Doesn’t have any markings on the buffer and I haven’t weighed the buffer to know the weight. Cycled the first round from each magazine fine. Failed to lock open on the last round.
The second lower is one number up in the serial numbers from the lower that belongs to this rifle. They are both Palmetto state armory lowers. This one has an A2 rifle buffer (I can’t remember if that is the right term, but it is the much longer one buffer). It cycled this rounds just fine. I’ll give this a few more tries. Would it make sense for a heavier buffer to make this rifle work better with this powder? I would think heavier would be less reliable?
Just cycled that last 15 rounds I had in this same lower and it worked flawlessly. Not much of a sample size to go off of but everything just felt right while firing
Yes.....we usually think 'gas issues" with problematic ARs....but it also be a buffer....buffer weight.....or buffer spring....I would first do the factory ammo a d one mag testing....if it still has makfunctions.....I would use the same lower and switch buffers, stepping up buffer weight, and see how that effects it or not.
Continue doing this with known factory ammo.....when it's running 100%....THEN add in the reload ammo ..and see what buffer weight the gun likes.
Continue doing this with known factory ammo.....when it's running 100%....THEN add in the reload ammo ..and see what buffer weight the gun likes.
What you are saying totally makes sense. I assumed that if the ammo didn’t have enough gas volume to cycle the bolt all the way back before the loss of pressure caused by the bullet leaving the barrel, that the added weight of the heavier buffer would further interfere with the bolt not being able to cycle fair enough back to pick up the next casing due to the extra force required to move the heavier buffer.
The only thing that would make the heavier buffer make sense is if the gun is actually over gassed and cycling to quickly with the lighter buffer not giving the magazine enough time to push the next round/magazine follower in front of the bolt face. And now with the heavier buffer is slowing stuff down and giving the magazine time to work.
I’m just spit balling stuff here trying to under stand the physics of what is actually going wrong.
As others have said before, they seem to think it is the powder. I just happen to have a few pounds of this powder to use and just enough bullets to finish off this powder. It did function very nicely with this heavy buffer.
It also does seem to run fine when I put factory ammo through the rifle.
Keep us posted on your results. Always curious to hear what effects an issue.
ironhead7544
Active Member
- Oct 27, 2018
- 188
My Speer 13 manual lists 21.0 grs IMR4198 with a 55 gr bullet as max for the 223 Remington.
Check your data and see if you can add .5 gr of H4198 to your loading.
Check your data and see if you can add .5 gr of H4198 to your loading.
- Jul 29, 2014
- 50,025
I don't disagree, but my main point is; you(OP) are using a 14.5" upper. That's a "combat" upper. It's not made for distance. It's not made for accuracy (although accuracy is always a plus in any platform), it's made for gunfights. It's made to shoot any pickup mag lying on the ground in any situation. In my mind, it is under gassed because of it's lack of dwell time. Maybe it's just me, but I want an AR that will shoot everything I feed it. Combat ARs should run on the over gassed side for that very reason.
I could be wrong. Did OP try different BCGs? I don't know. I like to start simple and work to the hard. I do know his mag choice can use some improvement. Needs to run some GI mags along the way.
MHO.
I have not run any different BCGs. I suppose that is something I could try.
The clown is right on with this.....and has a good point I wish I had hit on....I would definate switch of bolt CARRIER with a known good carrier (if you or a friend have one handy)....the reason I say carrier is I'm supposing the bolt is head spaced to the barrel....that is very Important....now, if you can head space other bolts and they pass....switch the bolt too and see what that does for you
there are 3 points on a bolt that could be out of spec and cause gas leakage....
I would also suggest you gage your gas tube, and your gas key on your carrier....when I inspect an AR.....I gage at least 8-10 points.....you could have 3 or 4 aspects of gas areas out of spec....and the gun may still run fine with 1 or 2 gas points out of "spec " ....and and isolated... ...but when you add them all together that's when issues begin...
Hope that makes sense.....and of course, yours may simply be the reloads....when things are back to normal I'd be glad to take a look thru her and see if we can't figure it out.
The 14.5 mid length gas barrel with welded brake operates well most of the time IF you use the proper ammo. If the OP was to use factory ammo, it would probably run fine. I say probably because there IS NO standard for port size on the 14.5 inch mid gas barrel and sometime you have to tweak them. I use 4198 in various platforms but it is not going to give the gas volume needed to run reliably unless maybe he changes the port size to .080 or even .090
You can do the research on line. I remember finding there were plenty of pages about the mid gas 14.5. Mine uses 335, CFE223, 748 for the most part and a H2 buffer. I did have to open the port a little but it was a home made job and I knew I would have to tweek it.
You can do the research on line. I remember finding there were plenty of pages about the mid gas 14.5. Mine uses 335, CFE223, 748 for the most part and a H2 buffer. I did have to open the port a little but it was a home made job and I knew I would have to tweek it.
From having built a few hundred ARs over the years. I would recommend checking the alignment on that gas block. You shouldn’t be getting any carbon spitting on the barrel like that. Just my two cents 
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