Poll: Having short stroking issues with new bolt carrier group

[Jzaden10]

Rifle is 18" careful with rifle gas length system and carbine 3 .oz buffer and carbine spring 39 rings about 11 in. Length. I had a 9310 steel bcg swapped it with a sharps DLC bcg and norte it is short stroking. I have done the loose gas key and worn gas rings test on it it's fine. Any help very appreciated

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[Medic!]

Ammo?

 

[Jzaden10]

I used 55 grain Winchester and tried 62 grain tulammo just to try it but something although it did cycle a couple times then back to failure to feed spitting it out but not feeding

 

[Joe13]

Get a new BCG

 

[11Charlie]

Go back to your old BCG if that fixes it then you know what it is.

 

[titsonritz]

Go back to your old BCG if that fixes it then you know what it is.

As stated in the other thread, this is your answer.

 

[v0lcom13sn0w]

last 18" rifle length build i did i had to drill out the gas port. heres my thread on it

AR15 Build issue. gas?

 

[edzz]

Try running it wet (more oil) for break in.

 

[titsonritz]

FYI, .0995 +/-.001 is the NSWC Crane spec for an 18" SPR gas port size.
Not that is does much good without a pin gage set to confirm.

 

[wp4]

I used 55 grain Winchester and tried 62 grain tulammo just to try it but something although it did cycle a couple times then back to failure to feed spitting it out but not feeding

My barrel is so short that all I ever seem to do is short stroke.

Running it wet is very helpful, but too much and you'll have a big mess on your hands!

A lot of time when mine is in the middle of a cycle she'll spit it out and won't let me feed any more in too.

Your not alone, bro. A lot of us have these same issues. A lot.

 

[Geardo]

My barrel is so short that all I ever seem to do is short stroke.

Running it wet is very helpful, but too much and you'll have a big mess on your hands!

A lot of time when mine is in the middle of a cycle she'll spit it out and won't let me feed any more in too.

Your not alone, bro. A lot of us have these same issues. A lot.

ummmm

 

[Geardo]

When I got a NIB BCG, it was a little tight. I polished the bolt on a buffing wheel just a little and it fixed the issue.

 

[Jzaden10]

Get a new BCG

It is a brand new bcg

 

[Jzaden10]

Go back to your old BCG if that fixes it then you know what it is.

Theres a couple things im going to try first I ordered a ultra light buffer spring it says it helps under gassed rifles

 

[Jzaden10]

My barrel is so short that all I ever seem to do is short stroke.

Running it wet is very helpful, but too much and you'll have a big mess on your hands!

A lot of time when mine is in the middle of a cycle she'll spit it out and won't let me feed any more in too.

Your not alone, bro. A lot of us have these same issues. A lot.

Have you tried a lighter buffer spring?

 

[Jzaden10]

Have you tried a lighter buffer spring?

Or buffer?

 

[Joe13]

It is a brand new bcg

Good friend of mine had the same issue with a high end brand new BCG.

Tried a different one, it started working again.

BCG went back to the factory and was verified it was out of spec.

Not all parts are perfect every time.

Before changing a bunch of other parts out it seems simple enough to put the old BCG in it or one from another build you may have or from a buddies rifle.

 

[notazombie]

...or try that new BCG in another rifle.

 

[Unka-Boo]

You check to see if the gas key was tight?

 

[Jzaden10]

Good friend of mine had the same issue with a high end brand new BCG.

Tried a different one, it started working again.

BCG went back to the factory and was verified it was out of spec.

Not all parts are perfect every time.

Before changing a bunch of other parts out it seems simple enough to put the old BCG in it or one from another build you may have or from a buddies rifle.

I put the old one back in and it cycled and shot just fine