HELP! Short stroking?

[ar15barrels]

The malfunction was a failure to extract I think

That's a failure to eject.
Failure to extract leaves the fired case in the chamber.
Failure to eject leaves the fired case sitting on top of the live ammo in the mag and shows up as a "double feed" (one live, one dead)

[chunger]

I honestly don't remember which one it was. . . It could have been a failure to eject w/ one live round and one dead round trying to get into the chamber.

I'll make note next time it happens.

[captain91]

Hope im not thread jacking

The "short stroking " sounds like thats happened to me more than a few times. I have tried all the function testing and I havent figured it out yet. I thought it might be my mags but then one time I used a friends and still had the same problem. Wat can I do about this? It's not easy trying to find anyone willing to take a look at black rifles in central cal.

[ar15barrels]

The "short stroking " sounds like thats happened to me more than a few times. I have tried all the function testing and I havent figured it out yet. I thought it might be my mags but then one time I used a friends and still had the same problem. Wat can I do about this?

Is the rifle new, or well broken-in?
500 rounds is well broken-in.

Keep it well oiled.
Check for smooth carrier movement in the receiver via the 45 degree angle test.

What type of barrel and gas system?
Sometimes short stroking is actually caused by a hiccup in extraction.
The short stroke test is done with an empty mag and loaded chamber.
Do this ten times and look where the bolt or carrier is being caught by the bolt catch.
If it consistently catches on the carrier (not the bolt), you have a short stroking problem.

Try another known-good bolt carrier group.
If that does not fix it, you may need to open up the gas port to proper dimensions.

I specialize in AR-15 barrels if you need help.

[captain91]

Is the rifle new, or well broken-in?
500 rounds is well broken-in.

Keep it well oiled.
Check for smooth carrier movement in the receiver via the 45 degree angle test.

What type of barrel and gas system?
Sometimes short stroking is actually caused by a hiccup in extraction.
The short stroke test is done with an empty mag and loaded chamber.
Do this ten times and look where the bolt or carrier is being caught by the bolt catch.
If it consistently catches on the carrier (not the bolt), you have a short stroking problem.

Try another known-good bolt carrier group.
If that does not fix it, you may need to open up the gas port to proper dimensions.

I specialize in AR-15 barrels if you need help.

Upper is well broken in
I do keepit oiled
45 degree angle tests good
the barrel is dpms 16" hbar
gas sysytem..... i dunno.
As far as short stroke test I will not be at a range for about another 2 months.
So I do not know where it is catching. It gets stuck halfway to feeding then I have to pull on the charging handle and bang buttstock on floor for a while. I just may need help with this. Thanks for the info

[ar15barrels]

the barrel is dpms 16" hbar

So I do not know where it is catching. It gets stuck halfway to feeding then I have to pull on the charging handle and bang buttstock on floor for a while.

Is it failing to fully cycle, or to feed?

DPMS barrels are known for their tight chambers.
What ammo are you using?

[m24armorer]

When I was younger I short stroked a lot......

[ar15barrels]

When I was younger I short stroked a lot......

My strokes are longer now than when I was 14 too...

[m24armorer]

14?

My rubber duck was in harms way much earlier....

[m24armorer]

Stroke Fu?

[Tweak338]

tight chambers,short stroking, stroke fu..
oh gawd

[m24armorer]

Had a failure to extract once....

Child support is expensive.

[Tweak338]

Had a failure to extract once....

Child support is expensive.

LoL
that is sig worthy right there.

[captain91]

My problem is the same exact as described by the thread starter. The round sometimes will not go into chamber all the way rather it will end up angled and jam up and then it difficult to remove.

[ar15barrels]

My problem is the same exact as described by the thread starter. The round sometimes will not go into chamber all the way rather it will end up angled and jam up and then it difficult to remove.

Post pictures.
This is probably NOT short stroking unless you are getting failures to eject which leaves the fired casing in the action while the new one tries to feed into the chamber.