[P34nut]

#include <amxmodx>
#include <amxmisc>

#define PLUGIN      "Test"
#define VERSION    "Test"
#define AUTHOR      "Test"

public plugin_init()
{
    register_plugin(PLUGIN,VERSION,AUTHOR);
    register_clcmd("fs","fs");
}

public fs(id)
{
    new iOrigin[3]
    get_user_origin(id, iOrigin, 3)
    
    message_begin(MSG_ALL, SVC_TEMPENTITY, iOrigin)
    write_byte(2) //TE_GUNSHOT
    write_coord(iOrigin[0]) // Position
    write_coord(iOrigin[1])
    write_coord(iOrigin[2])
    message_end()

    message_begin(MSG_ALL, SVC_TEMPENTITY, iOrigin)
    write_byte(9) //TE_SPARKS
    write_coord(iOrigin[0]) // Position
    write_coord(iOrigin[1])
    write_coord(iOrigin[2])
    message_end()

    return PLUGIN_HANDLED
}

Should work like this (write_byte( //TE_SPARKS changed to write_byte(9)