Mid-length ejection angle

**1168** · 08-02-21, 00:24

What Lysander said. Take the gas block off. The center of the rear set screw dimple should be the same distance from the shoulder as the gas port center.

Most “local” gunsmiths are complete morons, in my experience. Like, $&@# up a wet dream morons. Regardless of where “local” has been over the years. Anything past installing Glock sights is too complex. This is why I own a BRD jig, a drill press, and a MI URR. I no longer even trust local gunsmiths to do a P/W on a muzzle device that I’ve pre-installed. I take that shit to a body shop instead. At least they can follow instructions and not replace my shims with a crush washer.

Reputable gunsmiths do exist, and you can hear about them in this forum. Ned Christensen and John Thomas spring to mind. I’m sure Clint (Black River Tactical) would be able to do this job correctly, also.

**lysander** · 08-02-21, 10:16

Originally Posted by Wow

Here is an image of those measurements. I think it is closer to 0.250". I think I gave you the right value.

https://i.imgur.com/TbYHQeC.png

Your scale is graduated in 1/32 inch divisions, the gap is at least 1/32 inch, probably a half more.

1/32 = 0.03125

**Wow** · 08-02-21, 20:42

I got a borescope and this is the footage of it. It looks like the block is off a little bit. I don't know if this is bad or within the realm of good.
Would appreciate some input.

https://i.imgur.com/q2wcBP7.mp4

Am I crazy or is the hole in the gas block not even a circle. Looks like it is more eye or oval shaped?

https://imgur.com/a/hwm3Dlt

**prepare** · 08-03-21, 03:53

Did the barrel come with the gas block installed or pre dimpled?

**Wow** · 08-03-21, 11:11

Originally Posted by prepare

Did the barrel come with the gas block installed or pre dimpled?

It came pre dimpled

**prepare** · 08-03-21, 11:54

Originally Posted by Wow

It came pre dimpled

I thought Criterion barrels came with a dimple so it’s probably not an alignment issue.

Do you know how to check your gas rings on the BSG and ensure the gas key is tight?

**lysander** · 08-03-21, 16:46

You have a little erosion on the barrel port, and a little off center gas block, neither of which should cause severe under-gassing.

I see no major issue here.

And from the initial post I fail to see what the problem is. If you replace one brand new ejector spring with another brand new ejector spring you might see a similar change in ejection pattern.

People get way to wrapped around the axle worrying about ejection angle.

**Wow** · 08-03-21, 17:38

Originally Posted by prepare

I thought Criterion barrels came with a dimple so it’s probably not an alignment issue.

Do you know how to check your gas rings on the BSG and ensure the gas key is tight?

Stand the BCG on the bolt and if it doesn't drop it is GTG?