A Gamma Ray acoustic version i put together.

Listen to the song for the rhythm.
play this riff twice then start the chords.
 Main Riff
E||-----------------------|--------------------------|-----------------------|
B||-----------------------|--------------------------|-----------------------|
G||-----------------------|--------------------------|-----------------------|
D||-----------------------|--------------------------|-----------------------|
A||--------------------5--|-----5--5--5--5--5--5--5--|-----------------------|
E||--0----0----0--0-------|--------------------------|--3----3----3--3----5--|

E||--------------------------|
B||--------------------------|
G||--------------------------|
D||--------------------------| X2
A||--------------------------|
E||-----5--5--5--5--5--5--5--|
    

Play these chords to the same rhythm as the riff above

  Main riff- Chords
    E (022100@1)   D (xx0232@1)   G (320003@1)   Ae|--0-----2-----------0------------------------------------| (x02220@1)B|--0-----3-----------2------------------------------------|
G|--0-----2-----0-----2------------------------------------|
D|--2-----0-----0-----2------------------------------------|
A|--2-----------2-----0------------------------------------|
E|--0-----------3-----0------------------------------------|

Rhythm changes a bit here so try and put it together by listening.
 Verse
     D (xx0232@1)   G (320003@1)   Ce|---2-----------0--------------------------------------------| (x32010@1)B|---3-----------1--------------------------------------------|
G|---2-----0-----0--------------------------------------------|
D|---0-----0-----2--------------------------------------------|
A|---------2-----3--------------------------------------------|
E|---------3-----0--------------------------------------------|

 Chorus- same as the main riff except an added B afterwords. 
    E (022100@1)   D (xx0232@1)   G (320003@1)   Ae|--0-----2-----------0------------------------------------| (x02220@1)B|--0-----3-----------2------------------------------------|
G|--0-----2-----0-----2------------------------------------| X4
D|--2-----0-----0-----2------------------------------------|
A|--2-----------2-----0------------------------------------|
E|--0-----------3-----0------------------------------------|

          Be|--------------------| (x2444x@1)B|--------4-----------|
G|--------4-----------| X16
D|--------4-----------| 
A|--------2-----------|
E|--------------------|

There you go.
I'm giving you the pieces, just put them together.
it's a Pretty simple song.