@theeuroguy
The DD V7 SLW is one of the finest rifles DD makes, very compact, 14.5" barrel and has a decent MLOK hand guard. I have one and really like it.
The SLW comes with DD's version of a AR A2 flash hider, it is pin and welded to make the rifle 16.1" barrel length legal. I dont know of any suppressor that mounts to the flash hider.
Once you settle on the suppressor brand you are going to use, then send upper off and have them remove the DD flash hider and pin and weld a muzzle device that works with the suppressor brand you are running.
I am 90% Dead Air suppressors and my DD V7 SLW still has the original DD flash hider and I plan to send it off and have a Dead Air flash hider installed.
John at Retro Arms Works does the best work I have ever seen in the pin and welding area. He is fast, reasonable and you will not be disappointed.