Have you seen the director’s cut of Aliens? The one where they show the roboguns that have the motion sensors built into them? The Colonial Space Marines put a pair in the underground tunnels leading to the colony to slow down the aliens.
From Andy, here’s a (stupid but) fun version: the Paintball Sentry Turret.
From the site:
The EMT Paintball Sentry Turret is the first and only Video Relay Paintball Turret available. It comes loaded with standard options and can be customized to meet your needs. You will not find anything else like it.
On the field, The EMT Paintball Turret adds a whole new level of game play to any scenario game. It is also a huge hit for public groups when used to guard a base or target. The Video Relay Remote Controls allow physically disabled persons an opportunity to participate in paintball when they previously were unable to. It’s also a popular option for parents or children too shy to participate on field with more experienced players.
The unit is completely sealed from paintball impacts and is also available in both water proof and winter weather (up to -30 C) versions for the hardcore players who play year-round in the cold winters.
The EMT Paintball Sentry Turret can be upgraded with a number of options such as infinite 360 degree rotation, 1000+round hoppers, RPS upgrades, etc. There are also a number of customizable options and add-ons that can be installed for free at the time of purchase or bought for an existing setup.