You will need this adapter for the Argus 45.
https://donnyfl.com/products/kalibrgun-argus-1-2-x-20-adapter-a80?_pos=1&_sid=83fb16539&_ss=r
I recommend the Shogun .25/.30 1/2x20 #S25.
https://donnyfl.com/collections/ldc/products/1-6-x-8-inch-shogun?variant=41534577220