New weapon doesn't replace (GZDoom)

[XCMachine]

Hello, I know is a noobish and lame question but can someone help me with the code itself. I want to replace the pistol to a new pistol I made which is the P99. Here is the details:

ACTOR DoomGuy: DoomPlayer {
    Player.WeaponSlot 1, Fist, Chainsaw
    Player.WeaponSlot 2, P99
    Player.WeaponSlot 3, Shotgun, SuperShotgun
    Player.WeaponSlot 4, Chaingun
    Player.WeaponSlot 5, RocketLauncher
    Player.WeaponSlot 6, PlasmaRifle
    Player.WeaponSlot 7, BFG9000
}

ACTOR P99: Weapon Replaces Pistol {
    Weapon.SelectionOrder 50
    Weapon.AmmoGive 7
    Weapon.AmmoUse 1
    Weapon.SlotNumber 2
    Weapon.AmmoType "Clip"
    AttackSound "weapon/firehandgun"
    
    Weapon.BobSpeed 2.2
    Weapon.BobRangeX 0.4
    Weapon.BobRangey 0.2
    
    Inventory.PickupMessage "DoomGuy has picked up a Handgun"
    
    States 
    {
        Select:
            HGP9 A 1 A_Raise
            Loop
            
        Deselect:
            HGP9 A 1 A_Lower
            Loop
            
        Ready:
            HGP9 A 1 A_WeaponReady
            Loop
            
        Fire: 
            HGP9 C 1 A_PlaySound("weapon/firehandgun", CHAN_WEAPON)
            HGP9 C 1 A_FireBullets(1,1,1,7)
            HGP9 DEFGHB 2
            HGP9 A 0 A_Refire
            Goto Ready
            
        Flash:
            USGF A 6 BRIGHT
            Stop
    }

Edited April 28, 2019 by XCMachine

[Marlamir]

Try to use "pistol replaces pistol" instead of "weapon replaces pistol" and see if its work.

[Empyre]

Copy all of the Player.StartItem lines from DoomPlayer, and then edit them so the player starts with your pistol replacement.  You need to copy all of them, or the player will start with only your pistol, and not the fist and ammo.

[XCMachine]

@Marlamir I tried that method it didn't worked, however @Empyre's idea fixed the issue that I was having, thank you both for the helping hand! ^^