I need help with the bullet material. Line 13. What is wrong and how should it be done?

return {

toolname    = "Raygun"; 
firemode    = 2; -- 1 = AUTO 2 = SEMI 3 = BOLT
rpm         = 181;
damage      = 1000;
spread      = 0.02;
muzzle      = "MuzzleFlash";
firesound   = {"rbxassetid://131179973";};
reloadsound = "http://www.roblox.com/asset/?id=131164874";
volume      = 2;
bullet      = {
    outline = false;
    color   = BrickColor.new("Lime green").Color
    Material = "Neon"
};