[Ricochet]

There is an alternative worth mentioning. Some AEGs are actually quieted with the addition of an airsoft suppressor. You could add one onto the end of your barrel to get the desired length, and/or change the look. This will help with stealth outdoors. Another option is to go for the honey badger style look. You get carbine length, but you suppressor is nearly swallowed by a free float style rail system. Your inner barrel can then remain the same length. If it is just look you require, you can always lengthen the outside of the gun, and leave the inside alone as well.