The circuit board from vanilla is pushed a bit back in the tech tree with bob electronics, especially if you are using angel's mods as well. I think it'd fit better if the shotgun was made from basic circuit boards.

https://mods.factorio.com/mod/bobelectronics

I don't see any github repo to make a PR, but I've added a file "compatibility/bobelectronics" and required it from data.lua

[code]
if not mods["bobelectronics"] then return end

local ingredients = data.raw.recipe["blueprint-shotgun"].ingredients

for _, ingredient in pairs(ingredients) do
if ingredient.name == "electronic-circuit" then
ingredient.name = "bob-basic-circuit-board"
break
end
end
[/code]