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-   -   Stumped (http://www.firearmstalk.com/forums/f33/stumped-16939/)

diegokid 08-15-2009 12:09 AM

Stumped
 
I shoot several AR-15s/AR-10s and M-14s. I just replaced my barrel on the AR-10T with a Krieger Mweight fluted 26". The rifle will not extract/eject spent cases. It looks like the bolt just barely manages to start unlocking but doesn't. Rifle was working fine with old barrel just that the group size was opening up after about 15,000 rnds, yes I shoot alot.

I have checked everything from gastube alignment to ensuring that the gas port was drilled all the way through the top of the barrel. I can't figure this out at all. Any suggestions?:confused:

Dillinger 08-15-2009 12:12 AM

Ammo? Are you shooting reloads? If so, your old cases are sized for your old chamber, which is why you could be having an issue...

Dgunsmith 08-15-2009 12:44 AM

Gas port is too small. Measure your original barrel gas port as a point of reference. Carefully enlarge your port drilling carefully on a drill press until you are thru the outside diameter...not into the rifling on the other side .
If unsure...take it to a gunsmith.

They intentionally come with an undersized gas port.

diegokid 08-15-2009 12:45 AM

ammo
 
It does this with all ammo. I thought maybe the chamber was too tight but the go guage closes fine with the no-go not closing. Tried factory, mil surp, even resized some cases .005 below SAMI all with the same results.

Dillinger 08-15-2009 12:46 AM

Quote:

Originally Posted by Dgunsmith (Post 144594)

They intentionally come with an undersized gas port.

Really??

I had not heard that before. I respect your experience and am not trying to question you, but is there a reason they would do that??

JD

diegokid 08-15-2009 12:54 AM

Gas port
 
I've had to drill out the port on a few FAL's after putting a 16 - 18 inch barrel on them but this is the first on a AR-10 that I've had act this way. I've used several Kreiger barrels on my m-14 this is the first one on an AR-10T. Why would the port be too small from Kreiger?

diegokid 08-17-2009 12:21 AM

More checks
 
Gas port in the barrel is .092 so its actually a little larger than factory garrel. Went so far today as to change the buffer spring with one out of a AR-15. Still no luck. Any more suggestions?

TexasPatriot 12-09-2010 07:14 PM

Quote:

Originally Posted by diegokid (Post 144580)
I shoot several AR-15s/AR-10s and M-14s. I just replaced my barrel on the AR-10T with a Krieger Mweight fluted 26". The rifle will not extract/eject spent cases. It looks like the bolt just barely manages to start unlocking but doesn't. Rifle was working fine with old barrel just that the group size was opening up after about 15,000 rnds, yes I shoot alot.

I have checked everything from gastube alignment to ensuring that the gas port was drilled all the way through the top of the barrel. I can't figure this out at all. Any suggestions?:confused:

Check the barrel extension? The locking recesses may hold the answer. When you fire a round, the cartridge case changes dimensionally. This may magnify an issue with locking lug/recess dimensions. Too tight to fully disengage, perhaps? Just a guess....


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