My Post-Apocalyptic Shelter Levels Up Infinitely!

Six hours of trading time arrived at three o'clock in the afternoon. As Somo stepped out of the light door, the golden light behind him shattered after twenty or thirty seconds.

The light gradually turned into points of light, fell to the ground, and merged into the snowdrifts.

Except for the shelter, which was already piled up like a mountain of supplies, the depression once again returned to its former peace.

3,200 units of iron blocks, divided into two layers, have been densely packed around the underground shelter, covering an area of ​​about three or four acres.

The same goes for the copper blocks, which are neatly stacked and lying on the ground on the left side of the underground shelter.

With the current storage area of ​​the underground shelter, it is impossible to store these materials even if they are doubled several times. They can only be temporarily piled outside.

"It's great. In the depression, others can't detect me. There are so many neighbors here, and I don't have to worry about being stolen if I store it outside."

Walking on the iron block, with Oreo's warning, Somo was not afraid at all of people coming to steal resources near the shelter.

Even if there were, these people wouldn't be able to carry much at a time with their small and pitiful storage space, so there's no need to worry.

After using the storage space to move all the peripheral steel to the garage, Sumo picked up five units of copper blocks and nervously went to the second floor to turn on the generator.

After days of adventure and running around, I even almost lost my life in exchange for the supplies.

Finally, on the last day, it evolved into strength!

Looking at the small thermal weapon laser manufacturing tool that had started to perform self-tests, Sumo felt excited.

The steps to use a laser machine tool are not difficult. After adding magical modular technology, manufacturing has been simplified a lot.

You only need to click on the weapon you want to make first, put in the required materials as required, and after passing the machine tool inspection, you can perform a fool-like placement operation and wait quietly for the finished product to come out.

“Modular technology is indeed a good thing, but it’s a pity that we didn’t acquire a single modular machine tool this time.”

"But even if there are, these people won't necessarily be sold unless they are about to die."

Shaking his head and putting away some greedy thoughts, Sumo saw that the green light had turned on at the end of the self-inspection. Sumo gently clicked on the M-1 rifle and the material requirements popped up.

Three units of steel, two units of iron, one unit of copper, one unit of wood, two units of water, and

Ten degrees of electricity!

The machine tool also has its own battery module, which needs to be filled with a certain amount of electricity to ensure it is higher than the manufacturing value before it can start.

This is a requirement that may cause manufacturing failure or machine tool damage due to a sudden power outage.

Seeing that rapid charging had begun on the lower right side, Sumo was not in a hurry and sat patiently in front of the machine tool to wait.

The creation of firearms involves some seemingly simple but actually very complex specifications. For example, rifling is a very simple and important part.

Rifling, also known as rifling. Because its cross-sectional shape resembles a windmill, it is also called a windmill line.

Rifling can be said to be the soul of the barrel. The function of rifling is to give the bullet the ability to rotate, so that the bullet can still maintain its established direction after exiting the barrel.

Although there are records of the use of rifling in the 15th century, due to the difficulty of the manufacturing process, it was not popularized until the 19th century.

Without relevant knowledge reserves, Sumo could only hope that the machine tool would be powerful and not make mistakes!

Half an hour later, charging was completed. Looking at the manufacturing button popping up on the side of the machine tool, Soma looked sacred. He gently put all the materials into the storage module of the machine tool, which was currently only one square meter, and pressed the manufacturing button with both hands. , start making firearms for the first time!

Creak! Creak!

A harsh sound accompanied by a slight vibration began to erupt from the machine tool from the inside out as the button was pressed.

A creepy high-pitched cutting sound not only frightened Sumo, but also made the big and small sparks on the second floor scream in fright.

The upper laser probe begins to rotate slowly under the power of the machine tool.

Before Sumo could take a closer look at how the machine tool made weapons, an iron cover suddenly rose up from both sides of the machine tool.

Driven by the motor, the cover began to slowly form a round ball, leaving only some heat dissipation holes, completely covering the entire machine tool.

Then, a burst of dazzling light suddenly erupted from the heat dissipation holes of the cover, illuminating the research room with unusual brightness.

The high temperature caused by laser cutting began to float out along with the heat dissipation holes.

Gradually, seeing the temperature getting higher and higher, Somo simply summoned the lion-man's wind to start dissipating heat to the big iron ball.

When this cycle is repeated for five minutes, the light begins to fade.

puff!

As bursts of water vapor erupted, the cover slowly began to fall, revealing the true appearance inside.

At this time, where the finished product popped up, there was already a fresh gun with a distinctive shape and extremely offensive appearance.

From the tip of the gun to the tail, he looked at the gun body carefully. At the moment of harvest, Somo calmed down.

When the green indicator light came on again, indicating that Sumo could take the gun, the temperature of the M-1 rifle also dropped and reached a stable temperature.

After picking up the gun, Sumo felt its weight first.

"It's not heavy at all. The empty gun weighs about five kilograms. With bullets included, it should be between six and six and a half kilograms."

After removing the magazine, Sumo looked at the capacity.

The specifications of the bullets assembled in the magazine are 56 x 45 mm caliber, and the STANAG magazine used is similar to that on Earth, with a standard capacity of 40 rounds.

“If you don’t consider the name and the different pattern design, it’s really a pirated m4a1.”

Stroking the complex patterns on the gun, Sumo was not sure about its power, so he could only try to continue opening the machine tool to make ammunition.

The M-1 rifle uses M193 rifle bullets, which are conventional 45mm caliber. This small-caliber rifle bullet has a huge lethality that is disproportionate to its size.

The M193 bullet does not have a steel core, the bullet is filled with soft lead, and the copper skin wrapped around the bullet is very thin, making the entire bullet very soft.

After hitting the target, the warhead will rapidly deform and fragment, and the bullet fragments will form multi-hole penetrating wounds (that is, one warhead will punch several holes), causing severe bleeding.

However, the technology tree of firearms is not as simple as simply making guns.

The biggest problem facing all humans in the wasteland currently is the preparation of ammunition.

Even if the underground shelter is currently rich in resources, if you want to create suitable bullets, you still need to continue to point out a new technology tree.

Smokeless gunpowder!

Black powder burns slowly and has low pressure, so the bullet exits the chamber at a low velocity.

In order to achieve sufficient range and effect, simple physics dictates that the bullet must have a large mass, and the bullet mouth will naturally be larger.

Therefore, in the black powder era, rifle bullets of more than ten millimeters or even 20 millimeters abounded.

In order to achieve better results, in the late black powder era, compressed black powder was loaded to increase the chamber pressure, which could also provide a speed close to smokeless powder.

Smokeless gunpowder burns faster, with higher pressure and temperature, which brings faster speed, reduces the caliber and quality of ammunition, and reduces the logistical burden, but it also brings countless design changes.

Smokeless gunpowder brings smaller ammunition caliber, faster speed and flatter trajectory.

A flatter trajectory means less impact from distance errors.

For example, in trench warfare in World War I, it was common to hit the exposed head from about 300m. It is likely that the difference from the zero point by tens of meters will cause the bullet to hit higher or lower.

A flatter trajectory can reduce the trajectory error caused by distance, making it easier to hit the target.

"The method of preparing smokeless gunpowder in the TV series Hanyang Zao is a bit exaggerated, but there are points that can be used as a reference."

Putting the M1 rifle on the work table, Sumo began to think carefully about how to mass-produce smokeless gunpowder.

Without promoting the development of the ammunition technology tree, no matter how awesome the guns are in the future, it will be useless without bullets.

"The production process of nitrocellulose and guncotton is not troublesome. The only problem is the appropriate cotton. Then you only need to soak the guncotton with ethanol and ether and dry it to get smokeless gunpowder."

"It is also not difficult to prepare ethanol and ether. Ethylene can be extracted from petroleum, and ethylene can be used as a raw material for making ethanol. Ethanol can be obtained through hydrolysis of ethylene, and ether can be obtained through the catalytic reaction of ethanol."

Finding a piece of paper, Sumo tried his best to recall the few chemical knowledge and pieced it together from the TV series, and completed a specious idea for making smokeless gunpowder.

With a flash of light, after systematic appraisal, it was confirmed that there was nothing wrong with this design drawing and that the idea was correct.

"So, the last difficulty is cotton? If you want to make suitable collodion, the quality of cotton is very important!"

In the TV series Made in Hanyang, Xu Jianyin once presided over the development of sulfuric acid at the Tianjin Manufacturing Bureau, which solved the problem of relying entirely on imported sulfuric acid at that time.

Zhang Zhidong took a fancy to his outstanding talents and hired him to Hanyang Steel Pharmaceutical Factory to be responsible for the production of ammunition.

One of the main raw materials for making gunpowder is cotton. During his research, Xu Jianyin found that there were great differences between domestic cotton and foreign cotton.

Therefore, during domestic trial production, the temperature, humidity, time, pressure, liquid concentration, etc. should also change accordingly. Perhaps this is the main reason for the failure of Jiangnan Manufacturing Bureau.

In order to quickly find a production method suitable for China, Xu Jianyin "used a pestle and a mortar to refine it himself."

It only took half a year to finally produce a sample of smokeless gunpowder.

After testing, the effect of the sample is completely comparable to that of imported smokeless gunpowder.

This also shows from the side that as long as you find the right cotton, you can refine suitable smokeless gunpowder in a very short time.

"System, how many survival points does it take to create a pound of cotton used to make collodion?"

Instead of rushing to buy it in the market, Sumo opened the system panel and clicked on the creation interface. Sumo first recorded the system's requirements.

The price is not low, but not high either.

65 survival points can be exchanged for a pound of cotton used to make collodion, 300 points can be exchanged for a pound of prepared collodion, and 520 points can be exchanged for a pound of developed smokeless gunpowder.

A bullet needs to be filled with about 2g of bullets. One pound can fill 260 bullets. After conversion, it can be directly exchanged for gunpowder. The cost of a bullet is close to 2 survival points. What a loss!

"No, if I want to install bullets in the future, I must have a suitable production line. I will go directly to purchase cotton and practice it myself!"

Thank you all for your monthly votes. The defense is finally coming to an end. Updates can be submitted after May Day. I am really busy these days. Fortunately, I have your support. I love you!