Not every Blitz responds well to being moderated. Sometimes the back-pressure will cause it to fail to properly index the magazine when firing in semi or full-auto.
You will need this V2 adapter for the Blitz.
https://donnyfl.com/products/hatsan-blitz-1-2-x-20-adapter-a117?_pos=1&_psq=Blitz&_ss=e&_v=1.0
I highly recommend the Ronin .30 M18x1.
https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin?variant=41083934736427