Failure to eject

[4g64loser]

Some manufacturers have oopsies in their products as well. The PSA adjustable block on my 6.5 grendel was absolute dogsh!t. It burped gas front and rear, no matter how tight the screws were. A trip back to PSA and a (we returned it to factory settings) didn't fix things. I tossed an aero adjustable block on and the gun immediately ran like a top and stopped burping gas out all around the block.

The bore was too large. Seen that. When gauged, the bore of the gas block mics out oversized or, worse, out if round when checked with a dial indicator. This seems to be more common with adjustable gas parts than with old school stuff. I have actually never seen it on a taper pinned FSB. My go-to-hell rifle still has the taper pinned FSB that fn put on the barrel but I cut it from 20 down to 16 and rebored the gas port. Shoots soft but is HIGHLY reliable. Not svelte but it works every time.

 

[Boats]

I am going to guess that he is using a .750 gas block from the old GI profile or HBAR on a pencil .625" barrel.

OP: is there any gap between the barrel and the gas block?

 

[Biggfoot44]

In some configurations, you can take barrels off without doing anything to the gas blocks and muzzle devices.

While true , the new bbl must have A gas block also .

The question for the OP ;

Was * Just the Barell * literal the rifled tube ? Did you remove the gas block from previous bbl and then install the old gas block on the new bbl yourself ?

Or did the new bbl already have its own gas block when you bought it ?

 

[Dippah]

Lots of things can cause FTE. Since you mention the barrel swap, I'll ask if you checked gas port alignment. This is a very common source of trouble.

Thanks, looking in to that

 

[Dippah]

I took my AR to the range yesterday and it was a complete fail.
During Covid I swapped my barrel for a Faxon pencil barrel and every shot or two jammed. Any idea what the issue could be? It’s clean…I wiped it down and re-lubed it today

Covid took me away from my routine but no rust or anything like that

Thanks everyone for the support. I took the Handguard off and I think I see the issue. The gas tube fits fine… I’m missing the dowel pin that locks the gas tube in place with the gas block. Not sure if it wasn’t included or I missed it in the kit but hoping this is the fix

 

[outrider58]

Thanks everyone for the support. I took the Handguard off and I think I see the issue. The gas tube fits fine… I’m missing the dowel pin that locks the gas tube in place with the gas block. Not sure if it wasn’t included or I missed it in the kit but hoping this is the fix

That was more than likely your problem.