the shot gun Burster is the best one for those who don't buy premiums. Its bullets stay on the ground plus if most of the bullets hit some one that doesn't have shaild it will kill them. You can also upgrade it to have headshot +, buttshot +, crotchshot +, multi-shot, and fire +.
I always found the Blunderbuss to be the most powerful shotgun, because it usually produced instant one hit kills, while the Burster didn't always one hit kill, and sometimes took a bit to finish the enemy off, because it uses fire.
