These are bagpipes. I understand the inventor of the bagpipes was inspired when he saw a man carrying an indignant, asthmatic pig under his arm. Unfortunately, the man-made sound never equalled the purity of the sound achieved by the pig. ↗
And it has to do with having no inventory or stockpiles on the shelf, but items arrive as you need to build your product. What that means is that it's much more difficult to actually find stockpiles of already built weapons. ↗