You will need this adapter for the Eagle Claw.
https://donnyfl.com/products/copy-of-benjamin-marauder-mrod-1-2-x-20-unf-adapter-with-thread-protector-a7?_pos=1&_sid=9a81181c4&_ss=r
I recommend the Shogun .30 1/2x20 #S25. This will reduce pellet clipping while suppressing this airgun.