|A Sai Gong Chong and its ramrod, from 'Bing Lu (《兵錄》)'.|
Sai Gong Chong is a Jack of All Trades design that combines the portability of arquebus, reloading speed of Fo Lang Ji (佛狼機) and firepower of Fa Gong (發熕). While it obviously cannot surpass these weapons in their respective advantages, Sai Gong Chong is nevertheless a very versatile design. The practice of using one large cannonball greatly simplifies reloading process, so Sai Gong Chong has comparable firing rate as Fo Lang Ji. As it is a muzzle-loader, Sai Gong Chong is naturally more powerful than breech-loading Fo Lang Ji.
Judging from the drawing, Sai Gong Chong might be derived from the Fo Lang Ji design.