How can buy a new one magazine for my remington viper 522?!
Question: The short answer is, you can't. Unless you get really lucky and find a used stock mag or one of the few 25 round aftermarket ones (made by Ramline I think) they just aren't available. When Remington quit producing the gun in '98 they also quit producing parts for it shortly after. As far as I've been able to find, nobody makes any aftermarket parts or mags for this gun, and even finding a scope mount to fit it is extremely troublesome. If anyone else has some better news for this answer, please prove me wrong. Otherwise I'm afraid you're out of luck, just like the rest of us.
Answers: The short answer is, you can't. Unless you get really lucky and find a used stock mag or one of the few 25 round aftermarket ones (made by Ramline I think) they just aren't available. When Remington quit producing the gun in '98 they also quit producing parts for it shortly after. As far as I've been able to find, nobody makes any aftermarket parts or mags for this gun, and even finding a scope mount to fit it is extremely troublesome. If anyone else has some better news for this answer, please prove me wrong. Otherwise I'm afraid you're out of luck, just like the rest of us.