870 Marine Magnum

On mine it is aluminum, but rather light weight! But, no problems in the fifteen years since I bought it. This is my main bear defence gun (Oops - I probably shouldn't have started that) ;)
 
I've had a MM for about 8 years. I was eyeballing a MM at wholesale last week, they seem to be a tad shinier, and have a "J lock" in the trigger guard. The trigger guard is still some sort of coated aluminum. I am happy to say they still have silky smooth actions. :D
 
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