Raycasting being strange? First time using raycasts

To prevent people from shooting through walls by putting their weapons inside the wall and then firing, I was suggested the idea of using a raycast from the barrel to the head and in if a part is detected, the gun won't fire. This doesn't seem to be working for me when I put it in action - the raycast doesn't work as intended (not working on certain areas etc...).

    local firing = true
    local gunray = Ray.new(Gun.Barrel.Position, Head.Position)  

    local part, endpoint = workspace:FindPartOnRay(gunray, Character)
    if part then
        if part.Parent.name ~= Gun.Name then
            firing = false
        end
    end

All help is appreciated, thank you!