Beeman 1357 .177
You will need this adapter for the 1357 Underlever.
https://donnyfl.com/products/beeman-underlever-1357-1358?_pos=1&_sid=2f6e528d8&_ss=r

I recommend the Sumo .177/.22 1/2x20 #S6 for the .177.
https://donnyfl.com/collections/ldc/products/1-5-x-6-5-inch-sumo?variant=42950065412




Beeman 1358 .22

You will need this adapter for the 1358 Underlever.
https://donnyfl.com/products/beeman-underlever-1357-1358?_pos=1&_sid=2f6e528d8&_ss=r

I recommend the Sumo .22/.25 1/2x20 #S61 for the .22.
https://donnyfl.com/collections/ldc/products/1-5-x-6-5-inch-sumo?variant=33070855487531



Beeman 1359 .25

You will need this adapter for the 1359 Underlever.
https://donnyfl.com/products/beeman-underlever-1357-1358?_pos=1&_sid=2f6e528d8&_ss=r