Hey I Have Just Modified The Solo Above Slightly To Give You What I Think Sounds Right.
E------------------------------------------------------------------------|
B-----------10--------8-----10-------------------------------------------|
G-----------------10----------------10-------10-------9---------10--7----|
D-------10--------------------------------10-----10----------------------|
A---8--------------------------------------------------------------------|
E------------------------------------------------------------------------|
E----------------------------------------------------------|
B----------------------------------------------------------|
G-----7-----------------------/9--9--9----10---12----------|
D--8-----8-----10--7---------------------------------------|
A---------------------8------------------------------------|
E----------------------------------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/g/green_day/21_guns_tab_ver_26.html ]
E------------------------------------------------------------------------|
B-----------10--------8-----10-------------------------------------------|
G-----------------10----------------10-------10-------9---------10--7----|
D-------10--------------------------------10-----10----------------------|
A---8--------------------------------------------------------------------|
E------------------------------------------------------------------------|
E----------------------------------------------------------|
B----------------------------------------------------------|
G-----7-----------------------/9--9--9----10---12----------|
D--8-----8-----10--7---------------------------------------|
A---------------------8------------------------------------|
E----------------------------------------------------------|
E---------------------------------------------------|
B-------3----------1--------------------------------|
G-----3---3------2--------------/9~--9~--9~--9~-----|
D---3----------3------------------------------------|
A---------------------------------------------------|
E---------------------------------------------------|
Thanks Guys.