Gunsmithing 4. HOW-TO: Ultimate AR Chamber Polish

[Hellbender]

Part 4:

Wrap a strip of 320 grit emery paper around a snug fitting swab, secure it with a piece of tape. I use a couple of full turns so as to cover the tape.

Chuck the rod into a medium speed hand drill and polish the chamber....keep it out of the shoulder area, just polish the straight, parallel walls of the chamber.

This will help with extraction and brass life.

 

[The Mechanic]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

Seems a bit scary to me. I would be afraid of messing up the chamber. Have you ever had a problem after doing it?

 

[Hellbender]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

The 320 grit is pretty fine, you are only POLISHING the chamber, not removing any measurable amount of metal.

Also, the soft swab will not allow you to push too hard in any one spot.

No Problems!

 

[uscbigdawg]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

Been doing this with steel wool for years with no problems.

Rich

 

[okiefired]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

I'm sure no pro but I know I've been told and have read more than once that the brass should "grip" the chamber during firing thus the reason you make sure there is no oil in the chamber. Brass sliping exerts unneccesary preasure on the bolt face, least that's what I think I've read. That would be my only question with polishing the chamber walls. Just a thought.

okie

 

[Hellbender]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

Okiefired......

Here's more than you've ever wanted to know about chamber polishing.....

http://www.varmintal.com/a243z.htm

On an AR, I just go to 320 grit, it lowers bolt thrust forces about 500-700 lbs over going a full polish to crocus cloth, but still adds to reliability and brass life.

 

[okiefired]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

Ha ha! Wow, you're right, thats more than I ever wanted to know.

Thanks.

okie

 

[Sean the Nailer]

Re: 4. HOW-TO: Ultimate AR Chamber Polish

Thank you (re-post before deletion)