I had a pair of the gold Gaugemates but in 10ga/16ga.
They have rubber o rings around them to seal in the chamber.
I didnt particularly care for them, they made my guns really hard to close. Although I had one 10ga that was a little off the face and they would make it close like a vault door.
Im not sure anyone has actually done any chronograph testing with these gauge adapters. The 16 gauge loads I was shooting were 1 1/8oz @ 1350fps and they kicked noticeably harder than the RSTs 1 1/8oz @ 1150 fps. So I dont think the over sized bore is hurting velocity that much .
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