[LONG] a syntax error involving mouse 1 and 2?

I'm not good at making scripts from scratch, not even a bit when trying to make a gun script or something else, so i take other's people models and heavily modify them to my desire.

If you have ever played in some games like Zombie Tower or Build a hideout and fight, you may know about these guns which used cFrame, welds and transparency animations ( part A set transparency to 1 and part B to make it look like it moved from part A to B ). a user called manofthelol used these features a lot in his weapon creations.

he also probably made a minigun weapon too which used mesh offsets to "rotate" the 6 barrels; i took a modified version of that model which instead of firing parts with BodyForces, it turned into a raycast weapon which when shot, it will make small part fragments which the same color as the target Part shot by it.

the weapon has a main LocalScript called "Shooter"

Tool.Enabled = true
function onActivated()

    if not Tool.Enabled then
        return
    end

    Tool.Enabled = false

    local character = Tool.Parent;
    local humanoid = character.Humanoid
    if humanoid == nil then
        print("Humanoid not found")
        return 
    end
    local ammo = script.Parent.Ammo
    local maxammo = script.Parent.MaxAmmo
    firing = true
    while firing == true do
        wait()
        if reloading == false and humanoid.Health >= 1 then
            if ammo.Value >= 1 then
                ammo.Value = ammo.Value - 1
                local targetPos = humanoid.TargetPoint
                local lookAt = (targetPos - character.Head.Position).unit
                if script.Parent.Recoil.Value < 10 then
                    script.Parent.Recoil.Value = script.Parent.Recoil.Value + 1
                end
                if Spin > 50 then
                fire(targetPos)
                else
                wait()
                end


            end
        elseif reloading == false and humanoid.Health < 1 then
            Tool:remove()
        end
    end
    Tool.Enabled = true
end

--[[function onActivated2()

    if not Tool.Enabled then
        return
    end

    Tool.Enabled = false

    local character = Tool.Parent;
    local humanoid = character.Humanoid
    if humanoid == nil then
        print("Humanoid not found")
        return 
    end
    local ammo = script.Parent.Ammo
    local maxammo = script.Parent.MaxAmmo
    firing = true
    while firing == true do
        wait()



        if reloading == false and humanoid.Health >= 1 then
            if ammo.Value >= 1 then
                ammo.Value = ammo.Value - 1
                local targetPos = humanoid.TargetPoint
                local lookAt = (targetPos - character.Head.Position).unit
                if script.Parent.Recoil.Value < 10 then
                    script.Parent.Recoil.Value = script.Parent.Recoil.Value + 1
                end
                if Spin > 50 then
                Spin = 50
                else
                wait()
                end




            end
        elseif reloading == false and humanoid.Health < 1 then
            Tool:remove()
        end
    end
    Tool.Enabled = true
end--]]

the greened out part is supposed to be the mouse2 activation function; you can see the function is identical except it will keep changing the spin value to 50 instead of calling the fire(targetPos) function, because i want the gun to behave like the minigun you see in Valve's Team Fortress 2, if you ever played it.

the minigun's secondary fire will rev up the gun, but will not shoot and when you click Mouse1, it shoots. https://wiki.teamfortress.com/wiki/Minigun Players can begin spinning the barrel by holding down secondary fire, which will not fire any ammunition until primary fire is pressed. This can allow the Heavy to quickly respond to enemies when keeping the same position.

but the problem is that if you hold one of the buttons, when clicking the other one, it will stop revving or shooting, forcing the player to manually click the opposite button than you clicked first.

this is the weapon in question https://www.roblox.com/library/943150996/needs-to-be-fixed-minigun

                if Spin > 50 then
                Spin = 50
                else
                wait()
                end

my idea is to put an and if statement in the current syntax

                if Spin > 50 and Button1down == true then
                fire(targetPos)
                else
                ??? -- what would i put here if the above syntax worked, though?
                end

but how can there be a value to check if button1 or 2 is being pressed or not? exactly, there isn't

then what do i have to do for the gun to not stop revving when holding mouse2 then pressing mouse1 to fire or when firing then pressing mouse2?

(i don't think this is a good topic. i tried to explain as good as i could, though.)