You need this adapter for the Hatsan QE airguns. This works for any caliber .30 and lower. You will need the suppressor to be 1/2x20 thread for it to fit our adapter Please note that when you add a suppressor to a semi-auto airgun, it does not properly index the magazine. If you plan to single load and use a suppressor that'll be fine. I would also recommend using a suppressor one caliber size up to reduce the chance of pellet clipping.
https://donnyfl.com/products/hatsan-qe-1-2-x-20-unf-adapter?_pos=1&_sid=a2680c9cc&_ss=r


I recommend the Shogun.
https://donnyfl.com/collections/ldc/products/1-6-x-8-inch-shogun?variant=41534577220


or 


I recommend the Ronin for a shorter length.

https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin