Smoothing Barrel Extension Lugs

[Ronin22]

Got a Wilson Combat AR barrel and it scores/scratches the brass on the neck and bit on the shoulder of the fired case upon extraction/ejection. I can chamber and eject lives rounds and it doesn't happen. It's only on fired cases, so it's happening on the way out.

I think the barrel extension lugs are sharp at the 12 oclock. Thinking just using a piece of sand paper with my finger to smooth the back sides of the lugs a bit.

Possibly a better way? Thoughts?

 

[supercorndogs]

It's more the 1-3 o'clock lugs. The backside isn't what you want to smooth down, it's the machined edges that need deburred. Sand paper or a jewlers file will deburr then OK. I like to deburr that area and the feed ramps as well as polish the feed ramps before I install a barrel.

 

[John?]

@Ronin22

I use a manual deburring tool to lightly break the edges of rough parts. The tools come in all shapes and sizes so pick what you think will fit best. My most used deburring tool is a simple triangular tool, like a triangle file with no serrations. They are cheap and you can’t do a lot of damage with one.