AR barrel installation

[Josh Beauchamp]

I am getting ready to build a new AR and have been watching a few videos on YouTube and read what I can about the process. I came across a couple videos and a thread on another forum that talked about using blue loctite on the barrel extension. Supposedly it helps tighten up the barrel similar to glass bedding an action. Seems a little odd to me so I thought I would bring it here to see what yall think.

 

[benny hill]

If the barrel ext. is loose fitting in receiver, it will pretty much always be so unless you use steel shim wrapped around ext. Either way should shoot O.K. depending on barrel.

 

[Josh Beauchamp]

Hey thanks Benny. I knew the whole loctite thing sounded hinky and was hoping you or Mike would chime in on this. In know just enough about gunsmithing you know I don't know a damn thing about it.

 

[drmitchgibson]

You can find barrels with an oversized extension that is an interference fit (press fit).

Shim stock is cheapish though.

 

[Matt1911]

I don't think I've ever seen an AR barrel without the extension already installed.

 

[drmitchgibson]

Outstanding!

 

[Matt1911]

Outstanding!

Bombbastical

 

[Wall]

I don't think I've ever seen an AR barrel without the extension already installed.

I thought the same thing when I first read it. He means loctite around the outside of the extension when inserting it into the upper receiver.