Arca swiss mount on Benjamin marauder

If it has swivel stud you might be able to get this 

Caldwell Pic Rail Adaptor Plate with Durable Construction and Picatinny Rail Attachment for Outdoor, Range, Shooting and Hunting , Black https://www.amazon.com/dp/B01B6S8IOY/ref=cm_sw_r_apan_glt_fabc_TMXAGM467B8VDF467PCY

And than get a picatinny to arca adapter it will be farther out and not sure if it will support the entire rifle but will stabilize i think.