It's commonly accepted that East Asian people invented the crossbow. However, it seems they had crossbows that shoot bullets as well. As an example, Jing Fang uses this description when explaining his model of solar sustem and eclipses:

The moon and the planets are Yin; they have shape but no light. This they receive only when the sun illuminates them. The former masters regarded the sun as round like a crossbow bullet, and they thought the moon had the nature of a mirror. Some of them recognized the moon as a ball too. Those parts of the moon which the sun illuminates look bright, those parts which it does not, remain dark

I wonder if there's a graphical depiction or reconstruction of such mechanism. Could it be some sort of primitive rifle?

Additionally: Did western crossbows (since Roman Empire) evolve from Asian ones, or did they evolve from the gastraphetes? Roman crossbows are way more similar to Asian ones, but they were close to Greece and I didn't find anything about the Western x-bow evolution.

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    Bullet shooting crossbows existed in Europe e.g. look ctmuzzleloaders.com/ctml_experiments/bulletbow/bulletbow.html Nothing magical, just double bowstring forming a pouch for bullet. I suppose chinese used something similar – OON Dec 10 '17 at 3:47
  • @OON: That would seem to describe a "cross-sling" rather than a "cross-bow". I would also be wary of translation errors between "bolt" and "bullet" by someone with English as a second (or subsequent) language. – Pieter Geerkens Oct 7 '19 at 17:01
  • What is wrong with the information on Wikipedia – Mark C. Wallace Oct 7 '19 at 17:25
  • I wonder if we have any chinese language experts on the stack? when I type the word bow into google translate, it lists a second symbol which translates to both bow and crossbow. The article on chinese archery shows a depiction of a pebble bow being used to shoot at the creature causing an eclipse, so also associating the moon and sun like the passage in the question. Perhaps translation issue and the crossbow being looked for is, in this case, a bow... – justCal Oct 8 '19 at 14:13

"Rifle" is a bit ill defined here. A rifle is:

a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves ("rifling") cut into the barrel walls. The raised areas of the rifling are called "lands," which make contact with the projectile (for small arms usage, called a bullet), imparting spin around an axis corresponding to the orientation of the weapon.

That would increase flight stability of bullets, but the fins do that on arrows and darts already.

What the Chinese had was at least a repeating crossbow:

The repeating crossbow (Chinese: 連弩; pinyin: Lián Nŭ), also known as the Zhuge crossbow (Chinese: 諸葛弩; pinyin: Zhūgé nǔ, previously romanized Chu-ko-nu) due to the design upgrade contributed by Three Kingdoms-era strategist Zhuge Liang (181—234 AD), is an ancient Chinese crossbow where the separate actions of stringing the bow, placing the bolt and shooting it can be accomplished with a simple one-handed movement while keeping the crossbow stationary. This allows a higher rate of fire than a normal crossbow: there is a top-mounted magazine containing a reservoir of bolts that are fed by gravity, and the mechanism is worked by simply moving a rectangular lever forward and backward.

repeating crossbow

A video of this in action is here.

Bullet shooting crossbows:

A bullet-shooting crossbow, sometimes referred to as “stone bow,” is a modified version of the classic crossbow. The bow was usually constructed with wood or steel, depending on the preference. It typically utilizes bullets and stones as projectiles instead of the traditional quarrel. […]
Many intended to use the bullet-shooting crossbow as a weapon, but it had its limitations. While the bow worked well on small animals like squirrels and birds, it was not powerful enough to be a reliable weapon in war. The velocity was just too low for the bullets or stone to pierce skin, and therefore it didn’t cause much damage to humans. The bullet-shooting crossbow had the potential to fracture skulls, but as this was the only effective way to take down the enemy, the bullet-shooting crossbow didn't match up with the standard crossbow in wartime.
In addition to the low-velocity shots of the bullet-shooting crossbow, the projectiles were not as effective as the bolt on the standard crossbow. The sharp bolts of the crossbow did more damage than the slow-moving, blunt bullets of the bullet-shooting crossbow. Because the standard bolt does more damage, the bullet-shooting crossbow was reserved for hunting smaller animals. There was no reason to use a bolt-shooting crossbow to hunt squirrels when a smaller, less-powerful weapon could get the job done just as effectively.
Another flaw lies in the material of choice: steel. Steel bows require more energy to return the bow to its original position and therefore deliver less energy to the shot itself. Bows made of wood typically shot much faster than those made of steel.

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    Seems to me primary reason to even consider firing stones is simply how much easier they are to obtain whereas arrows or darts have to be manufactured and can't easily be re-used especially if they found their targets. – Jeff Dec 10 '17 at 16:14
  • Ok, but the Chinese Dragon still shoots darts, and the bullet crossbow from your link is westen and from XVI AD, while Jing Fang describes that as early as first century BC. I thought of a rifle example in the sense that it could have a long metallic barrel, but of course, it could be anything! – Devin Dec 10 '17 at 16:16
  • @Jeff Only irregular stones are easy to find! Launchable stones are quite hard (to manufacture) &(at)Devin: Rifle means rotating projectile, thought you were after the higher rate of fire. – LаngLаngС Dec 10 '17 at 16:46
  • @LangLangC: Good point but even "manufactured" (shaped) stones are easily recoverable (and what if only your side had such weapons that used them) and I would guess even irregular stones could be used at short distances to some effect. – Jeff Dec 10 '17 at 16:50
  • @Jeff Small stones are much less powerful: launch- and air drag, large impact area distributing force; you need much more hits of them to chink the armour where just 1 bolt kills. Simple slings or atlatl types are what generals handed out to those who only had stones. – LаngLаngС Dec 10 '17 at 16:56

The Chinese bullet crossbow was more like a slingshot than a rifle (or usual crossbow). It fired hard objects such as stones, rather than sharp objects with metal points such as bolts or arrows. The "bullets" were first placed into pouches, which were fitted with springs. The "crossbow" itself used a double string mechanism. This fact, together with the pouch and spring arrangement made it much easier for the "average" person to shoot it than was the case with regular bows (which required highly skilled archers).

The bullet crossbow had much less force than a regular crossbow, which in turn had much less force than a rifle. None of the crossbows used gunpowder or other explosives that gave guns their force. But the bullet crossbow, which was designed for "amateurs" (e.g. for hunting birds or small animals), by design had less force than normal crossbows. A bullet crossbow could kill a human only with difficulty (e.g. a direct shot to the skull, like a slingshot).

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