Are these inserts.

whughett · Sep 21, 2019

A ROA 45ACP stainless conversion cylinder. These look to be blued steel tubes.

Jackrabbit1957 · Sep 21, 2019

Looks like powder residue burnt into the stainless.

351 WINCHESTER · Sep 21, 2019

Ring around the collar.

whughett · Sep 21, 2019

Ok, stands out around the stainlessI guess. 45ACP smokeless loads only.

Gemmer · Sep 21, 2019

I get those rings on my S&W 357 all the time. Wipes off with a lead removal cloth.

792mauser · Sep 22, 2019

Burn rings.
Have em on my stainless 65 and vaquero

Dave Markowitz · Sep 24, 2019

Agreed on them being residue rings. I have them on most of my revolvers.

J-Bar · Sep 25, 2019

Inserts would not overlap; it would mean there was no wall between the chambers.