Not exactly sure on the weight but you can check on mossbergs website I believe. As for the reliability of the Mossberg 500, its one of the most reliable shotguns of all time, its even used by our Military and is the only pump action shotgun to pass their stringent 3443 testing. Take care of it and it will last you a lifetime.
"Those that would trade essential liberty for temporary security deserve neither liberty nor security."-Ben Franklin
Woe to those who make unjust laws and to those who issue oppressive decrees. -Isaiah 10:1
Blaming guns for death is like blaming forks for obesity