I have little to no idea what this is. A shotgun of some sort, I guess.
When fired, the bolt (that handle you see on the side) is pushed back, and to fire it again you have to push it forwards. You reload this by inserting more shells into the top of the ammo resiviour thing and letting them drop down.
On an unrelated note, I can edit sounds now! So expect more releases with lots of different sounds spliced together for ultimate badassery.
EDIT: For some reason there are like 4 admins patrolling this side of the site even though I'm the only one here. Apparently AOS submissions are funner to flag than, say, th people who're stealing crap without credit who really deserve them. Is angry