A Tale of Two Crush Washers, or Two Crush Washers One Barrel, and other AR oddities

[ReservoirDawg10]

Anderson gas block on a 7.5” .300Blk. Cracked in half during firing.
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Nice grain structure there

 

[Jambo]

Anderson gas block on a 7.5” .300Blk. Cracked in half during firing.
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In your top photo, are we seeing a pretty massive casting void on the inside of the gas block? That's kind of what it looks like.

Nicely manicured thumbnail, by the way. I mean, you know, for a guy.

 

[cmshoot]

In your top photo, are we seeing a pretty massive casting void on the inside of the gas block? That's kind of what it looks like.

Nicely manicured thumbnail, by the way. I mean, you know, for a guy.

Either a casting void, or an area that was cracked and got carbon in it.

Not my thumbnail.

 

[cmshoot]

Don’t let your “friends” work on your stuff, and don’t monkey with stuff that you don’t know enough about, then blame it on a “friend”.

Guy wanted a new barrel extension installed on this barrel. Claimed a “friend” removed the barrel extension from his barrel to “polish” it, or some BS.

You can’t easily/readily/cost effectively install a new barrel extension on an AR barrel that already has a gas port. During manufacture, the barrel extension is installed, which then tells you where top dead center is. The gas port is THEN located, drilled, and reamed.

The odds of being able to install a new receiver extension, and have it index properly to the gas port, are pretty slim. If you were to shim the gas block to get it to time correctly, you would be messing with the headspace.

 

[ReservoirDawg10]

Don’t let your “friends” work on your stuff, and don’t monkey with stuff that you don’t know enough about, then blame it on a “friend”.

Guy wanted a new barrel extension installed on this barrel. Claimed a “friend” removed the barrel extension from his barrel to “polish” it, or some BS.

You can’t easily/readily/cost effectively install a new barrel extension on an AR barrel that already has a gas port. During manufacture, the barrel extension is installed, which then tells you where top dead center is. The gas port is THEN located, drilled, and reamed.

The odds of being able to install a new receiver extension, and have it index properly to the gas port, are pretty slim. If you were to shim the gas block to get it to time correctly, you would be messing with the headspace.

View attachment 3075714

Musta had the mechanic in there telling him how to accurize his 6.8 rifle

 

[CTS Tactical]

There are a lot of geniuses out there.

 

[Old_School]

Don’t let your “friends” work on your stuff, and don’t monkey with stuff that you don’t know enough about, then blame it on a “friend”.

Guy wanted a new barrel extension installed on this barrel. Claimed a “friend” removed the barrel extension from his barrel to “polish” it, or some BS.

You can’t easily/readily/cost effectively install a new barrel extension on an AR barrel that already has a gas port. During manufacture, the barrel extension is installed, which then tells you where top dead center is. The gas port is THEN located, drilled, and reamed.

The odds of being able to install a new receiver extension, and have it index properly to the gas port, are pretty slim. If you were to shim the gas block to get it to time correctly, you would be messing with the headspace.

View attachment 3075714

Sent from my SM-G781U1 using Tapatalk

 

[JET 5.45x39]

The only thing you could maybe do is keep torquing the extension till it meets the right orientation i believe max is 160 or so minimum is 130

 

[CTS Tactical]

The only thing you could maybe do is keep torquing the extension till it meets the right orientation i believe max is 160 or so minimum is 130

No guarantee that the headspace would be right though.

 

[JET 5.45x39]

No guarantee that the headspace would be right though.

True, but a few minutes with a go/no go and
Torque wrench be interesting to try