I'm a security guard for one of the Naval Air Facilities/Marine here, there is also a ballistic testing grounds here which I have access to and am around the fire arms range alot. I base most of my knowledge on how weapons sound in real life as opposed to how they sound recorded. Most videos when recorded a weapon sounds much different because of the quality of the video, what kind of mic was used and what not. Video doesnt capture the true nature of the sounds, most people think that when they see movies or a video of a fire fight that when they sound big and huge , that thats how they really sound. The time of day atmosphere, surroundings and if at night or during the day determine how you'd hear sounds. I don't like sound effects cleaned up so much that they sound synthesized, like from a keyboard or CD. but thats just me heh heh, so thats why I made some sound mods, specially changing ArmA's and OFP Hope that sheds a little light there for ya.