A_Raise
From ZDoom Wiki
A_Raise
(no parameters)
This function must be called in a weapon's Select state sequence. It should not be used anywhere else. It is responsible for raising the weapon and for entering the ready state sequence when it is done.
Each time A_Raise is called, the weapon moves further up the screen as it approaches the ready position. You can therefore make a weapon raise faster than the default by calling A_Raise more than once within the same tic.
Examples
Here is an example of a basic Select state that makes use of A_Raise to bring the weapon up to the ready position:
Select: SHTG A 1 A_Raise loop
This will raise the shotgun up from the bottom of the screen when it is selected. Once the shotgun has reached the ready position, A_Raise will automatically jump to the Ready state.
This gun raises into view twice as fast as normal:
Select: FAST A 0 A_Raise // The 0-tic delay means this will execute within the same tic as the next line FAST A 1 A_Raise loop
