In fact, rifled guns are not too high-tech things, rifled guns appeared very early in history, in the fifteenth century, there were Germans who made straight rifled guns, and in the sixteenth century, some people made spiral-shaped rifling, which can give the projectile rotation when it is discharged, and improve the accuracy of shooting.

However, because of the difficulty in manufacturing rifling, no one has invented a machine tool that can be used to engrave rifling in large quantities, and there is no one who can solve the problem of rifled gun loading difficulty for the time being, so although the rifled gun has been trial-produced for a long time, it has never been popularized, let alone recognized by the armies of various countries.

As for the problem of projectile loading, the first is that people are still using round projectiles, even if such projectiles are given the ability to rotate, the improvement of accuracy and power is not very obvious, and the musketeers who use rifled guns, when loading projectiles, because the projectile is slightly larger than the diameter of the inner chamber, it must be stuck in the rifling, and it is very difficult to load, sometimes even with a hammer to knock through the strip, in order to stuff the projectile into the barrel, clumsy and terrible, sometimes because the projectile can not be stuffed into the chamber, This made the musketeer very embarrassed, so although the rifled gun had various advantages, it was never liked by the user.

Moreover, the production cost of rifled guns is much higher than that of ordinary smoothbore guns, and it is not easy to manufacture, so this rifled gun has not been recognized by all parties before the invention of the Minne bullet, and has not been able to replace the smoothbore gun.

So in fact, the manufacture of rifling is not a very difficult thing, and the Western craftsmen who were earlier than this era solved this problem, so it is naturally not too difficult for Xiaotian to do, and he can learn from the way of hand-rifling in history to make rifled guns.

For this reason, Yu Xiaotian has seen some methods of how to make rifling and some simple mechanical tools from various ways from various sources, and this matter is not difficult for him.

But the reason why he waited so long to take this thing out is for a reason, to make a rifled gun, you must first have the basis for manufacturing a smoothbore gun, and the requirements for the process are high, if he can't even get an ordinary smoothbore gun, then if he wants to produce a rifled gun, it is naturally also Mochizuki in the water, which is out of reach.

Therefore, he used to focus on the production of smoothbore guns, first opened the gold finger, and made a relatively advanced flintlock pistol in this era, first occupied some advantages, so that his guns trained a group of craftsmen who were good at making smoothbore guns.

And now it seems that the seawolf's gun has accumulated quite a lot of experience after such a long time to build a smoothbore gun, the product quality has begun to stabilize, and the proficiency of the craftsmen has also reached the requirements.

Yu Xiaotian has also read a few time-traveling novels before, and as soon as the pig's feet in them appeared, they began to explode weapons in a big way, at least they directly popped the Migne rifle, and some simply exploded all kinds of modern weapons, even AK in the coming year, sweeping the world invincible!

Yu Xiaotian can be said to scoff at this point, it is nonsense at all, even if it is not difficult to make a rifled gun, at least there must be a foundation that can make an ordinary smoothbore rifle, and directly make a rifled gun, and even make modern weapons, and it is said that it cannot solve the problem of materials and technology, and even if it can be solved, it also involves a set of chemical industries, which is simply pure foolishness.

That's why he took his time step by step, gradually perfected the foundation, and only at this time did he put the trial production of rifled guns on the table.

The old-fashioned rifled gun is actually to put it bluntly, the rifling is carved into the barrel of the smoothbore gun, and the rest of the place is not much different from the smoothbore gun, just a development product of the old-fashioned smoothbore gun.

Yu Xiaotian didn't think about eating a fat man, directly built a modern rifling machine, the sketch he drew this time is an old-fashioned rifling machine invented by gunsmiths a long time ago, the structure is very simple, no need for too high skills, no need for too strong driving force, completely rely on manpower to produce.

In some time-traveling novels, when the pig's foot was making the Mine rifle, the rifling said that after the rifling was first carved diagonally on the iron plate, and then the iron plate was rolled up, just to match the rifling interface to form a rifled barrel, which seems to make sense at first glance.

But in practice, this method is simply nonsense, any skilled craftsman, even if he finds the best blacksmith in the world, let him use this method, without the help of modern high-precision machinery for rolling iron plates, want to roll together the iron plates that depict the rifling, and just fit the interfaces together exactly together, there is no possibility at all, not to mention that at this time, the barrel is built, and the method of hammer welding is used to hammer weld the seam position of the iron pipe. Even if the rifling is engraved inside, it can be docked, and the rifling is still smashed flat during hammer welding, and it still comes out with a smooth smoothbore barrel.

Therefore, if you want to get rifling, you can only make a good smoothbore barrel first, and then find a way to carve rifling inside, so that it is possible to make the barrel of a rifled gun.

Yu Xiaotian didn't give blacksmith Zhang too much introduction and explanation, so he let blacksmith Zhang lie on the table and watch the sketch he drew by himself, and he found a chair to sit down and drank the tea sent by his subordinates.

Zhang Blacksmith carefully studied this sketch, and gradually understood the machinery drawn on this sketch, and found the key to it, straightened up and said to Xiaotian with admiration: "The big boss, the small one has seen the rough!" It's not too difficult, but the small ones should be able to get out!

If I'm not mistaken, the key to this guy is probably on this threaded roller, pulling this thing, just enough to take this drill bit to rotate in the barrel, and when pulling out or pushing it out, it happens to carve a groove out of the inner chamber of the barrel, which is the rifling that the big boss said! Pull out one wire at a time, reciprocate a few times, and you can pull out the rifling! ”

Yu Xiaotian put down the tea bowl, applauded with a smile on his face, got up and said with a smile: "Lao Zhang! I'm convinced of you, but I just looked at this sketch and saw the key!

You are right, the key is on this roller, the spiral groove on this is just stuck here, and this rod is not a drill bit, it should be called a hook knife, the front is made of stainless steel similar to the drill bit you make or even harder hook cutter head, it can be two opposites, or it can be one, first penetrate into the gun tube, install the hook knife on this head, and then pull the roller from this side, the roller will rotate when it is pulled out in these slots, drive the hook knife into the barrel, and rotate while walking, When the hook knife was pulled out of this end, rifling was carved into it.

Of course, once can not pull the rifling, to repeatedly pull a few more times, how many times is appropriate, depending on the level of your hook knife, after pulling out this or two rifling, adjust the hook knife, you can continue to pull out other rifling, now the rifling is not too much, first from the four as long as it is enough, and so all the rifling is drawn out, other things follow the old way to be, loaded up is a rifled gun, when you try to know how powerful this guy is!

By the way, I forgot to tell you, this roller with spiral groove does not need to be made of iron, and it can be used directly by asking the carpenter to make it from hardwood, otherwise it will be too heavy, and it will be very difficult for manpower to pull it up! This is not too difficult for a carpenter, a carpenter with similar skills can do it!

Do you see that? Take advantage of the things you don't understand at this time to ask quickly, and after you have figured it out thoroughly, I'll make it quickly, I'm in a hurry to use this kind of good guy!

Although our previous flintlock pistols were not bad, the range was a little too close, and there was no far distance for the Ming army's bird guns, in case of the Ming army's musketeers, I am afraid that our brothers would suffer a lot of casualties!

But with this guy, no matter who it is, if they meet us, they will only be slaughtered! Even if the arquebuses of the Tessie meet our soldier musketeers, they are looking for death! ”

Blacksmith Zhang still doesn't understand very much, just carving out a few spiral-shaped grooves in the barrel can make the fire gun hit farther and more accurately, but since Yu Xiaotian is so confident and swears a promise, then he has a blind worship of Xiaotian now, and firmly believes that Yu Xiaotian's words will definitely not be wrong, so no matter whether this thing is easy to use or not, even if he uses the strength to eat milk, he must hurry up and make it, otherwise he will live up to Yu Xiaotian's trust and expectations for him.

So he hurriedly agreed, and began to look at the picture carefully, and then mentioned some of the things he didn't understand too clearly to Yu Xiaotian, so Yu Xiaotian explained to him carefully.

Yu Xiaotian has never done anything like this, and the later Celestial Dynasty is very strict in banning guns, even if he is a fanatical firearms enthusiast, he doesn't dare to get this kind of thing easily, secretly makes a fire dog with a steel pipe, and he doesn't dare to easily take out a fire dog to show off, so he is just a theoretical giant with theoretical knowledge and standards, and he is a short man in action.

If he is allowed to make this kind of rifling machine by himself, even if he is given a few years, he may not be able to make something qualified, so this kind of thing still has to be done by professionals, and Blacksmith Zhang is undoubtedly the most suitable person.

The two of them gathered around the table and discussed for two hours, until it was dark and Fang An came to invite Yu Xiaotian back to the city for dinner, and the two ended the discussion, and Blacksmith Zhang had already thoroughly understood the basic structure and principle of this rifled machine.

Originally, Yu Xiaotian wanted to let Blacksmith Zhang and others go to eat together, but Blacksmith Zhang was still in the mood to eat at this time, he was in a hurry to go back and began to tinker with this machine overnight, and he had to hurry up to read the notebook that Yu Xiaotian gave him, so he categorically rejected Yu Xiaotian's invitation.

If this was replaced by someone else, Yu Xiaotian would have been annoyed a long time ago, but if it was a blacksmith Zhang, it would be another story, so he laughed and left Blacksmith Zhang to work overtime overnight, and followed Fang An back to the city.

(It's been a few days!) The chrysanthemum hurts, and the monthly pass keeps bursting the chrysanthemum for several days! ）