Xavier the barrel is threaded and has a thread pitch of 1/2×28. You would place the suppressor directly on. I highly recommend the AAC 102262 556-SD 5.56MM SUPPRESSOR ----------- silencerwarehouse.com/product-p/847128009092.htm

As Josh said you basically just need a suppressor with a direct thread mount or one of the many options that have proprietary quick detach muzzle devices that thread on and the suppressor attaches to. The actual muzzle of this pistol looks to be recessed back into the handguard a bit, overall diameter of the suppressor you intend to use might be a concern. Lastly, shooting suppressed with an AR can be a bit unpleasant without some mechanism for mitigating the excess gas and particulate matter ejected back at you by the gas system. I use adjustable gas blocks on any AR I shoot suppressed, I have also heard of some charging handles with a gas-trap mechanism but have no experience with them. With a regular non-adjustable gas system I always notice my eyes burning after just a few rounds.

Yes, the barrel is threaded with 1/2×28 thread pitch. So you just need a 1/2×28 suppressor of your choosing in 556/223. Hope this helps