The silencer in "Stalker 2: Heart of Chernobyl" is a very useful special weapon accessory in the game. With it, you can kill with guns secretly. You can find the silencer in the supply pile. Some merchants may also sell them, but of course it is best if you can buy them.
How to get the silencer in STALKER 2
If you can't rely solely on a knife for stealth kills, then a firearm will be your best choice. Weapons with silencers can help you wipe out an entire enemy camp without alerting anyone (if you're skilled enough). You can occasionally find firearms with silencers in certain hidden supplies or missions.
You can also find silencers in supply piles, and some merchants may sell them. A suppressor for the PTM pistol can be found close by at the start of the game. During the mission "Dangerous Visitors" in STALKER 2: Heart of Chernobyl, enter the building where Grumi is and open the storage room at the end of the second floor. Inside will be a Viper-5 pistol, some supplies, and a silencer that can be attached to the Skiff Service Pistol.
The suppressor in STALKER 2: Heart of Chernobyl does not break or have any significant impact on the weapon's performance. When using them, make sure to aim for the enemy's head to ensure a quick kill.