Aaron Lewis - Granddaddys Gun Chords & Tabs

This is my first time submitting in tabs, so I'm sorry if you don't like it...
Should be played the way Aaron does it, in Drop D tuning.
There are only 4 chords, G, Cmadd9, D and Em but the last two stings you keep on the 3rd frets. 
The chords should look like this.

        E A D G B E
     G: 3 2 0 0 3 3
[ch]Cmadd9[/ch]: 0 3 2 0 3 3 
     D: 0 0 0 2 3 2
    Em: 0 2 2 0 3 3

G                        [ch]Cmadd9[/ch]
It sets above the mantel on a couple rusty nails
G                
It's not worth a lot of money
[ch]Cmadd9[/ch]
But it damn sure ain't for sale
D                                [ch]Cmadd9[/ch]
The good lord only knows all the stories it could tell
                  G    ( I add a Cmadd9 but its optional)
My Granddaddy's gun

G                                     [ch]Cmadd9[/ch]
He bought it new out of the sears and robuck catalog
G                                  [ch]Cmadd9[/ch]
And it shot a many shells over the back of an old bird dog
D                                 [ch]Cmadd9[/ch]
And it backed a burglar down when grandma took the safety off
               G
Granddaddy's gun.
[ Tab from: https://www.guitartabs.cc/tabs/a/aaron_lewis/granddaddys_gun_crd_ver_4.html ]
[Chorus:]
[ch]Cmadd9[/ch]                  G
It's just an old double barrel twelve
D                           Em
The stock is cracked and it kick's like hell
[ch]Cmadd9[/ch]                   G               D
It wouldn't mean what it mean's to me to no one
[ch]Cmadd9[/ch]                                  G
Cause I can still hear his voice when I put it to my shoulder
D                             Em              
A gun's like a woman son it's all how you hold her
[ch]Cmadd9[/ch]                   G                D     
He taught me a whole lot more than how to hunt
[ch]Cmadd9[/ch]                     G                D                                
And one of these days I'll pass it on to my grandson
                  G         (I add a Cmadd9 here) optional
My Granddaddy's Gun

G                                 [ch]Cmadd9[/ch]
That old man gave it to me on the day I turned thirteen
G                                  [ch]Cmadd9[/ch]
With a half shot box of shells and a kit to keep it clean
D                                    [ch]Cmadd9[/ch]                   
I keep a picture in the case of that sweet old man and me
                   G
And Granddaddy's gun

[Chorus:]
[ch]Cmadd9[/ch]                  G
It's just an old double barrel twelve
D                           Em
The stock is cracked and it kick's like hell
[ch]Cmadd9[/ch]                   G               D
It wouldn't mean what it mean's to me to no one
[ch]Cmadd9[/ch]                                  G
Cause I can still hear his voice when I put it to my shoulder
D                                 Em              
A gun's like a woman son it's all how you hold her
[ch]Cmadd9[/ch]                   G                D     
He taught me a whole lot more than how to hunt
[ch]Cmadd9[/ch]                     G                D                 
And one of these days I'll pass it on to my grandson
                  G      (I like to add a Cmadd9 and another G as the bridge)
My Granddaddy's Gun

[ch]Cmadd9[/ch]                               G         
There's a long beard hanging on the livin' room wall
D                              [ch]Cmadd9[/ch]       G   D
That I got with a box call and Granddaddy's gun
Cmadd9                              G                              
There's a Shot up sign out there on forty nine
D                          Em                [ch]Cmadd9[/ch]       G   D
That me and billy joe shot up one night With granddaddy's gun

G                        [ch]Cmadd9[/ch]   
It sets above the mantel on a couple rusty nails
G                                    [ch]Cmadd9[/ch]                    
It ain't worth a lot of money but it damn sure ain't for sale.

(I add a D then G and let it ring out)