Biathlon cocking lever swap on Kral?

Hey guys,

First off, does anyone know anyone who makes a biathlon cocking lever or (cocking lever attachment) for the Kral Mega?

Second, if not, does anyone know if the lever off the Kral Puncher Jumbo will fit?

I simply want that style cocking lever and i have someone who may 3D print one but they are overseas so shipping is kind of a pain when it costs more than the piece your buying -_-

Also I am looking for single shot tray, and extra mags (177 caliber)