You can't build a sentry gun on normal minecraft however I think there is a mod for it though.
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Its helps build a house? P.S i lov the game :)
You can build anything ! but the best will be to build a auto smelter, Here is a link to the tutorial....
there are no mods for minecraft on xbox
Build a city of your own!
You can build structures in Minecraft by placing blocks you find throughout the game. (MOUSE2 by default)
use your creativity... thats what minecraft is about
Go to a site called minecraft wiki
there are none
Build.
You can build your house anywhere you want in the world of Minecraft. One of the best places is to build where you first find coal. Also, try to build in a place that's flat.
Minecraft is a popular game. In this game you get to build a world.
...You don't.