Short stroking?
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Old 01-27-2014, 01:50 AM   #1
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Default Short stroking?

So I shot my AR some more on Friday. I started rapid firing it but it would quickly jam. Slow shots were fine... But as soon as I started shooting quickly it had problems. Now normally my ar doesn't spit the empty casings too far from the ar. I've described it as lazy before, like it doesn't really want to spit them out but it does. They go maybe 3-5 feet from my ar. I didn't think that was a problem but then id fire off like 3 shots before the bolt would lock open with ammo still in the mag. Id have to use the bolt catch to drop the bolt. Does anyone know why this is? Doesn't happen unless I rapid fire.
Is it possible my rifle is short stroking?
Also I've used 2 different brands of ammo and it ejects both the same. It's also a new rifle with <100 rounds through it. Maybe 70 or 80 max have been out through it



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Old 01-27-2014, 01:54 AM   #2
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Pics would help. Mainly looking for type of ar15. Build specs. What buffer spring etc.

Common mistakes are using a rifle buffer in a carbine build. Using rifle recoil springs in a carbine build. Misaligning the gasblock so it restricts gas flow, misaligning barrel nut so it binds the bcg.. Those are the common issues associated with the symptoms described.


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Old 01-27-2014, 02:03 AM   #3
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I'll get some pictures up in a few minutes when I get a chance
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Old 01-27-2014, 02:04 AM   #4
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Which two types of ammo?
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Old 01-27-2014, 02:19 AM   #5
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Quote:
Originally Posted by SkilletFan24 View Post
I'll get some pictures up in a few minutes when I get a chance
Pics of the buffer and buffer spring and stock, good close up of the gas block good close up of the inside of the upper at the gas tube entry point.
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Old 01-27-2014, 02:27 AM   #6
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Quote:
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I'll get some pictures up in a few minutes when I get a chance
Try to get a sharp close-up of the bolt face.
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Old 01-27-2014, 02:36 AM   #7
disappointed & disgusted, But DETERMINED...
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and are the casings coming out Damaged??
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Old 01-27-2014, 02:44 AM   #8
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Default Short stroking?

imageuploadedbyfirearms-talk1390794063.616887.jpgimageuploadedbyfirearms-talk1390794086.624757.jpgimageuploadedbyfirearms-talk1390794104.521119.jpgimageuploadedbyfirearms-talk1390794133.522469.jpgimageuploadedbyfirearms-talk1390794177.441205.jpg
The ammo was some Federal stuff (I think) it was brass cases in a black box with a white eagle on it. And some Tula. Both shot fine but I only tried rapid with wolf. Both ejected the same shooting slow.
I included a picture of the side of my bcg because the retaining ion protrudes just a bit. Not a whole lot but you can feel it if you run your finger along the side of the bcg. I don't know if that's a problem.

The cases come out fine, although there are some scrape marks along the side of it. Not really deep but I doubt I could buff it out. They'd probably stay after cleaning up the brass/steel.

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Old 01-27-2014, 02:48 AM   #9
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HArd to tell but the fsb looks canted. Anyway to get a pic from above of the gas system fsb and barrel nut

Need close up pics of the screws of your gas key on the bolt carrier and where the gas key attaches to the carrier.

Forgot to add other issues can be worn or damaged gas rings or loose gas key.

To test the rings extend the bolt out all the way and stand it on the bolt face, if the bolt retracts into the carrier under its own weight your rings are worn and need replacing. Worn/damaged rings also cause cycle issues
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Old 01-27-2014, 02:57 AM   #10
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Default Short stroking?

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The gas keys are good, the bolt stays extended.

I built my AR from a kit so the bcg didn't come staked. I put loctite on the screws instead and they're locked in place. May as well be staked.
I also thought my fsb looked canted too, but I wasn't sure.



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