Shortest suppressor out there will extend you r length 3.75" and requires a 11.5" barrel to fit so it can "slip over" something. Even then you must go to an SPR style gas block and flip forn sight on the rail. The two to look at are the Troy and the Surefire cans. Troy is 21.5 oz and the Surefire 17 oz and the Surefire has an integrated A2 flash hider. Troy can use any flash hider including A2, Vortex, Phantom etc. Troy is $880 and Surefire over $1000. Surefire wont let anyone but the military do testing on the suppression figures of their cans. I am in the process of buying a Troy can and will send it off to silencertests.com to get it evaluated. However you wont have results till Christmas at the earliest. I know its not what you are looking for but its still shorter than a 16" barrel with A2 flash hider or a 10.5" barrel with regular suppressor on it.
Other than that you want to look at the Noveske/Kink flash hider to direct sound forward and away from your team members. Its the size you want and will help save your ears but it is NOT a suppressor in the truest sense. It simply redirects the sound forward instead of allowing it to go in all directions. Light it off in a small enclosed room and its going to be LOUD. On the plus side its cheap and only weighs 4oz.