Sentry Gun
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The EngineerHow am I going to stop some big mean mother hubbard from tearing me a structurally superfluous new behind? The answer: use a gun. And if that don't work... use more gun.
Sentry Guns, also known as Turrets or Sentries are a Building type built by the Engineer. Just like other Buildings (except the Jump Pad) they have 3 levels, and each level costs 200 metal to upgrade. The Gun itself is a device on a tripod contructed of metal and team colored-paint, and locks on to enemies with perfect accuracy.
A level 1 Sentry Gun is an automatic single machine gun with an internal magazine with a team colored top with a team colored light to the left side of the barrel.
A level 2 Sentry Gun has 2 gatling guns on either side and is belt-fed ammuntion. It appears to use an automatic cranking system to rotate the barrel, as indicated by the 2 electric cables visible.
A level 3 Sentry Gun is identical to level 2, with the exception of a rocket launcher which come out of the top of the Sentry Gun and fires 4 rockets at once.
The Sentry Gun is a powerful force for area denial. The Sentry Gun has perfect accuracy and an incredible amount of damage potential, as well as noticeable knockback. It locks on to the closest target within range and line of sight and opens fire until the threat is out of sight, out of range or neutralized. A well-placed Sentry Gun can singlehandedly defend a point, an intelligence briefcase a Payload cart or anything else. However they take significant time to set up, have limited range, are not very mobile, and can be easily destroyed via an Übercharge push, a Spy's Sapper or the Demoman.
Functionality
General
The Sentry Gun costs 130 metal to build, by far the most expensive Building for the Engineer to construct, and just like any other Building (except the Jump Pad) it takes 200 metal to increase to the next level, totalling in 530 metal to fully contruct and upgrade a Sentry. With each level the Sentry Gun becomes stronger, gaining additonal guns, rockets and Health. However the range does not change with level. The Sentry Gun's health and Ammo cna be replenished by any allied Engineer hitting it with a Wrench. This allows a team with multiple Engineers to all support each other. Allied Engineers however cannot
When a Sentry Gun is placed, it starts with 0 health but like all Buildings it gains health as it constructs. This continues until it reaches it's maximum health. Any Sentry Gun routinely rotates 90 degrees aroudn itself, however it will lock on any enemy entering its range, even if it was behind the Sentry Gun. However the Gun turning takes some time, which can allow enemies to slip through. The Sentry Gun beeps as its turning, and the beeping increasees with level upgrades.