The Portable Assault Sentry is avalible to some Scout and Tech classes in Siege.
This deadly weapon is roughly the size of a large backpack, but don't let its size fool you. Once activated, the weapon unfurls and is set to auto-target any enemy threat.
The Sentry drains battery life at an accelerated rate and, once it's deployed, can't be restored to its original portable condition.
When the battery runs out, it will auto-destroy.
As all other mechanical devices the Sentry is extremally vunerable to DEMP 2 fire.
In JA+ you can obtain the Sentry as well as most of the other items having the /ammerc command used on you. In the FFA game mode the Sentry will consider every player but its owner an enemy.