I was making a remake of Pandan's Sentry with The_Titanium. But there were huge problems with the model which no one helped out with. So its failed.
Although if someone wants to finish it, i would gladly send them the model (Although its only level 1). It works like the Tank. Its a playertype with a AI mounted to it. That way the turret can aim whatever direction while the base stays foward. We were also planning to have a 'crouch' animation that just turned the turret left to right. Mixed with beeping could make the perfect sentry replica.
If anyone wants it, PM me. Its MS3D btw.