Gee, Guys; I didn't want to bring on a Sh*t storm!
I thought the first thing I should do, was open up my gun safe and dig these out to make sure the name was correct.
What I have now, are from Seminole Gunworks, "Sub Gauge Chamber Inserts" Chamber Mates. in 16 Ga.-28 Ga."
They are Silver colored. ("Silvers?")
Anyway, I have had these for over 5 years, (Lying in my gun safe waiting for my 16 to come back from the custom engravers (long story)and something I read on this site said maybe they weren't in business anymore, or were going through a bankruptcy or something.
So, this Christmas Morning, I looked at the Container they came in, and it didn't say 10-12 gauge reducers were EVER available.
These do have the sliding "extractor/ejector" parts so one could shoot, then just pull the fired shells out.
So, I am sorry I called them "GaugeMates" when I should have said "Chamber Mates."
Merry Christmas, and be nice to each other,
Sam Ogle, Lincoln, NE