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

[User170512]

I've heard good things about JB Weld....

Yeah, just a couple dabs on your bolt lugs will fill any gaps and perfectly headspace your AR. Don't need no armorer or nuthin.

 

[cmshoot]

You never know what you’ll find when working on a customer’s gun.

 

[Outlier]

How?

 

[BubbleHead09]

If you run into this problem again just run by Publix and get some dry ice. Drop the barrel in it for 20-30 minutes and it may just drop right in, especially if you warm the upper a bit.

Now, it may never come out....

I have always worried about this because of the aluminum receiver with the must harder barrel.

 

[cmshoot]

Having the right tools and fixtures helps.

For instance, without something like a Geissele or Midwest Industries reaction rod, you may be tempted to grab your upper receiver in your vice, and crush it to the point that it's very difficult to get a BCG in and out of it.

 

[Control for Smilers]

Having the right tools and fixtures helps.

For instance, without something like a Geissele or Midwest Industries reaction rod, you may be tempted to grab your upper receiver in your vice, and crush it to the point that it's very difficult to get a BCG in and out of it.View attachment 5821906View attachment 5821907

well that riser says made in china.

 

[cmshoot]

well that riser says made in china.

If you're gonna run a Chinee optic, you may as well run a Chinee mount.

 

[Jambo]

Having the right tools and fixtures helps.

For instance, without something like a Geissele or Midwest Industries reaction rod, you may be tempted to grab your upper receiver in your vice, and crush it to the point that it's very difficult to get a BCG in and out of it.View attachment 5821906View attachment 5821907

"Tightened upper receiver fit to bolt control group for better accuracy"

 

[tstover]

Having the right tools and fixtures helps.

For instance, without something like a Geissele or Midwest Industries reaction rod, you may be tempted to grab your upper receiver in your vice, and crush it to the point that it's very difficult to get a BCG in and out of it.View attachment 5821906View attachment 5821907

Having the right tools and fixtures helps.

For instance, without something like a Geissele or Midwest Industries reaction rod, you may be tempted to grab your upper receiver in your vice, and crush it to the point that it's very difficult to get a BCG in and out of it.View attachment 5821906View attachment 5821907

"Tightened upper receiver fit to bolt control group for better accuracy"

He ran out of acuwedges so had improvise on the fly

 

[Asbestos]

Must be something in the water. SOTAM just got one of those “precision fit” receivers too.