How would I go about, or start off? I am not asking for a script just a way of doing it?
Checks from a certain radius of a brick, say.. 5 studs or something. Checks if player has Gun selected and the player is currently holding it, if the player is holding a Gun within the radius of the brick then make GUI from the brick Visible.
I am not sure if that made alot of sense... to people heres an example; I walk towards a brick within 5 stud radius, I select my Gun, then a the GUI is visible.
How would I start? I don't really know anything about distance..

2 comments
How would I do the check?
Create a function that gets all players in the server and checks if they are 5 studs or closer away from the brick using magnitude, then return those players in a table, then do a repeat wait or a loop (however you wish to do it) and make it wait until the amount of numbers in that table that is returned is greater than or equal to 1 (or just greater than 0) then you can do the Gui pop up stuff.