Why does my BCG have a silver ring.

88Mustang

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There is no markings on the BCG or the bolt. Can someone clue me in?
it is silver where the bolt goes in. "That shoulder thingie that goes up"
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NiB coating for the gas rings, making for easier clean up?

Is the inside of the carrier, and/or the tail of the bolt also silver?
 
NiB coating for the gas rings, making for easier clean up?

Is the inside of the carrier, and/or the tail of the bolt also silver?
Tail is black. I got a colt competition a couple of years ago, I had a cryptic coatings bronze bcg and swapped it in on the colt.
 
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