The hook-shaped cutter is placed on the steel tie rod that is slightly thinner than the diameter of the gun chamber, and the height of the hook-shaped scraper blade can be adjusted by adjusting the screw of the tie rod layer, and each pull through the barrel once, the lever moves a few microns, and with the uniform rotation of the barrel, a certain degree of winding rifling is drawn out, and after reaching a predetermined width, the second rifling wire is pulled in a different position.

An ordinary rifled gun only needs to be broached about 20 times, while the barrel of the gun made by the No. 1 Base Arsenal needs to be broached about 100 times, and the more times it is pulled, the finer and more precise the groove formed.

This is the hook knife broaching method, the first-level skilled worker can use the hook knife broaching method to pull out the rifling of the barrel, and the instrument used, even if there is no steam machine tool, can also use a manual wooden machine with a relatively simple structure.

There is also a scope used in the sniper gun, glass is also a very profitable industry in this era, but Yun's existing industry makes enough money, and increasing the wealth will only make outsiders more blushing, so Yunyi only established a small glass factory in the No. 1 base, and produced glass in small batches for internal use, mirrors, telescopes, and scopes are the main products of glass.

In fact, the manufacture of firecrackers is a very simple matter, even without a machine tool, a skilled blacksmith can beat an iron plate into the barrel with just a hammer, but the advent of machine tools has accelerated the production of firecrackers, so that firecrackers can be equipped with large quantities of armies.

Yun Yi had personally experienced the power of the firecracker, taking the standard infantry gun as an example, it was difficult for a ninth-order martial artist to resist the bullets fired by the infantry gun within a range of 100 zhang, and once it was hit, it would either be dead or injured.

However, the facial features of the warrior are more sensitive than ordinary people, and if the infantry gun is used to shoot the high-level warrior at a relatively long distance, the warrior is easy to dodge, of course, if the number of fire guns is relatively large, it is difficult for the warrior to dodge.

As for using the fire gun to deal with the innate martial artist, it is expected to have little effect, Yun Yi is not an innate martial artist, and the Yunhua Yun clan has not given birth to an innate martial artist, but he also knows that the innate martial artist can release internal force externally, and his strength is at least five times that of the ninth-order martial artist after tomorrow.

There is an internal force to block, unless it is at a very close distance, it is difficult for the fire gun to cause damage to the innate martial artist, if it is shot at close range, with the speed of the innate martial artist, it is also difficult for the fire gun to hit.

Although there is not much danger to the innate martial artists, the number of innate martial artists is also very small, and the possibility of appearing on the battlefield is also very small.

The killing distance of the standard infantry gun can reach 300 zhang, and the accurate hit target can be guaranteed within 180 zhang, while the maximum range of the ordinary sergeant using the bow and arrow in this era can reach 70 zhang, and if the heavy crossbow is used, the maximum range can reach 100 zhang, and the effective killing distance is 50 zhang.

In addition, there is an iron bow specially used for warrior shooting, and its maximum range can reach 200 zhang, but the farther the arrow is shot, the greater the deviation, far less than the firecracker.

With the presence of the firebolt, it is completely possible to suppress the enemy's bow and crossbow, and distance is the magic weapon of the firebolt.

Although it is difficult for the firearm to threaten the innate martial artist, there are still artillery in the firearm family, if the innate martial artist is directly hit by the cannonball, the possibility of survival is pitiful, in other words, the artillery is actually an enlarged version of the firearm.

The artillery manufactured by the arsenal is mainly divided into four types according to the caliber of the artillery, two-inch, three-inch, four-inch, and five-inch, all of which are smoothbore guns.

The two-inch artillery is the smallest, only two feet long, weighs 35 catties, each time with gunpowder seven or eight taels, each launch can be loaded with 100 small lead or small stones weighing 5 money, with a large lead bullet or large stone bullet weighing 30 taels on the top, when firing the large and small bullets fly out together, the roar is like thunder, the lethality and radiation range are very large, especially suitable for field warfare, bombarding the enemy's dense combat formation, effectively suppressing its crazy offensive.

The two-inch gun is small and easy to carry, but the maximum firing range is only 170 zhang, and the distance is its biggest disadvantage.

The five-inch artillery is the largest, one zhang long, weighs 2,500 catties, can fire solid bullets, shotguns, flowering shells, etc., the effective firing range can reach two and a half miles, and the maximum firing range can reach four miles, but the five-inch artillery is too bulky and difficult to transport, and it is suitable for guarding fixed targets.

The power of artillery can threaten the innate martial artist, but the artillery is a smoothbore cannon, don't think about the shooting accuracy, plus the artillery firing speed is relatively slow, unless the artillery salvo, otherwise the possibility of hitting the innate martial artist is very small, if there is a congenital martial artist rushing to the artillery position, then you can only be abused and killed, but if the innate martial artist does not know the true situation of the artillery, it is also very likely to use artillery to hit or kill the innate martial artist.

In addition to artillery, there is also a firearm whose power can cause damage to innate warriors, and that is rockets.

The rocket is composed of two parts, one is a rocket launcher or called a bazooka, the main body is a cylinder, four feet five inches long, the inner diameter is a little larger than the two-inch rocket, to ensure that the rocket can be loaded in, the tail of the rocket launcher is sealed, the rocket is launched from the head of the bazooka, the total weight is thirteen catties, the effective range is twenty-five zhang, and the maximum firing range is seventy zhang.

Rockets are equivalent to individual artillery, the power is similar to that of two-inch artillery, but the operation of rockets is more convenient, pick it up and put it flat to light the fuse and launch it, the rocket is enough to threaten the innate warrior in the hands of the person who can keep up with the innate martial artist, one rocket is not enough, then several more are launched together, it can be said that the rocket is a more effective way to deal with the innate martial artist.

There is also the last type of firearm, the grenade, the sergeant who has used the grenade also called the palm grenade, the rough structure is an oval palm-sized iron shell, the iron shell only leaves an opening on the top, used to hold gunpowder, and then a fuse is installed at the opening.

When using a grenade, it's good to directly ignite the fuse of the grenade and throw it out, but limited by the power of black gunpowder and the amount of charge, the lethality of the grenade is relatively small, at most it can only injure the acquired martial artist, if it hits an ordinary person, even if it is not killed, it will be seriously injured.

Muskets, artillery, rockets, and grenades are the firearms currently produced by the arsenal, and the arsenal is mass-producing these four types of weapons of various models, while also developing four new models of weapons under the leadership of Yunyi's disciples, such as the continuous firing of the bead firearm, the artillery with a larger caliber and longer range, the rocket with a larger caliber, and the grenade with a larger volume (how to feel that it is the flowering shell of the artillery).