When adding individual weapons into our maps the Silenced Sniper Rifle is not available as a choice so you have to go into MODIFIERS then PLAYERS INVENTORY here you can select the starting weapons from a list.
There are 34 Weapon Loadouts to choose from, for the Silenced Sniper Rifle you want to select this below.
Sniper Stealth
6P9 / SA-50 (Both Silenced)
Then you can add in other weapons manually into your map if you wish to give the player other choices where they can swap weapons.
I really like the Bull (silenced shotgun - Special Weapon) would love that and other Special Weapons to be patched in as well as a custom loadout.
Hey CraziDave66.
FALLEN CHAMP provided some really helpful information regarding the editor menu and settings, alongside info on items, allies, enemies and other hints and tips.
You can find the thread HERE.
Additionally, other members of the community should be happy to help you further with any additional questions you may have.
Thanks.