A Lower

A_Lower is a code pointer used in the weapon lower animation for all weapons.

moves the Y position of the weapon sprite towards the bottom of the screen by a small amount each time it is invoked. If the bottom of the screen is reached, the next weapon is selected and the raise state is invoked to bring it up. is usually used in a state that is an infinite loop that repeatedly jumps back to itself; the loop terminates when the weapon has finished lowering.

Uses
The  code pointer appears in the following states in Doom's state table:

Example
The following is an example of how to set the  code pointer in a Dehacked file:

Pointer 21 (Frame 34) Codep Frame = 82

Or using BEX syntax:

[CODEPTR] Frame 1234 = Lower