LordJarhead released a video in which you can hear a new feature he is working on, InsideBuilding-Sounds. The sounds in this video will not be in the final version!
Quote LordJarhead : As the title says, this is a quik test of the new feature of JSRS
1.5: InsideBuilding-Sounds. Means: If a shooter is inside a building,
you can hear an extra loud echo sound. The sound is different for each
gun.
Keep in mind, its just a test, none of these sounds will make it in the
final version since they need to be tweaked alot to suit other
surroundings and buildings (Wood buildings, Stone buildings, Hangers,
Tower etc.).