From Viper we have these Single Size Moderstor Covers.
These Moderator Covers arer designed to fit onto your Suppressor with a hook and loop closure system and adjustable bungee cord retention to allow this cover to fit a variety of sizes. These covers also feature a pair webbing staps for attachement of different accessories.
These moderator covers come in a single size and are of 22cm Long and 5cm diameter at its smallest.