he chords are just

intro:

G5     D     Am
               
G5     D     C  

G5     D     Am

G5     D     C
VERSE 1

G5       D               Am
Mama take this badge off'a me
G5      D           C   
I can't use it any more
G5      D              Am
gettin dark to dark to see
G5            D                  C
Feels like im knockin on heavins door

Chorus:

G5          D5                Am5
knock knock knockin on hevins door
G5          D5                C5    
knock knock knockin on hevins door
G5          D5                 Am5
knock knock knockin on heavins door
G5          D5                 C5
knock knock knockin on heavins door

Solo:
G5 D Am

G5 D C

G5 D Am

G5 D C

Verse 2:

G5    D                 Am 
mama put my guns in the ground
G5     D            C
i cant use them any more
G5              D              Am
that cold black cloud is comin down
G5            D                  C  
feels like im knockin on heavins door

Chorus:

G5          D5                Am5
knock knock knockin on hevins door
G5          D5                C5    
knock knock knockin on hevins door
G5          D5                 Am5
knock knock knockin on heavins door
G5          D5                 C5
knock knock knockin on heavins door

then it just continues on as

G5 D  Am

G5 D  C