Aftermath kurz is a AK-47 Beta Spetz with solid stock. The gun pictured on the basspro website is an Kraken aftermath Ak-47 with black furniture.
From the aftermath website.
Aftermath guns are chronied with .2 Gram bbs
This model shoots at 350fps an indoor CQB model.
Krakens shoot at 380 fps on .2s some people have gotten 400 fps on .2s
Looks like basspro got the info on their website wrong.