In the open space next to the study hall, I couldn't wait to pick up the submachine gun and check the attributes:

Submachine Gun Lv.5

[Maker: Pipe (Metal affinity has increased all stats by 10%]

[Bullet initial velocity: 440 m/s]

[Rate of fire: 330 rounds/min]

[Magazine capacity: 66 rounds]

[Durability: 2200/2200]

[Effective range: 110 meters]

[Notes: Very good novice guns]

Peanut Soy Milk once shot in the club, she saw this attribute, and was surprised: "This gun is quite good, there are sixty-six bullets, and the recoil is not strong just now, now we finally have combat effectiveness." ”

nodded with murderous intent and said, "If this gun had been made earlier, Brother Niu might have survived." ”

The university monk said helplessly: "It took a long time to build this manufacturing station just now, and the construction time of the submachine gun is ten minutes, so we hurried to finish it." ”

Pipe nodded: "But the manufacturing table in the back doesn't take so much time, and you can use this manufacturing table to make the corresponding parts." ”

Xiao Fei was also very excited, he pointed outside and said, "Come and go out with us, bring back the nitrate that we just sprinkled, four big baskets." ”

The university monk took the submachine gun and said confidently: "I'll go, see who dares to provoke my chrysanthemum eagle-level god, do you know what it means to have no bullets." ”

The pipe ruthlessly pointed to the bison carcass and said, "The bullets are all on the ground, and it is indeed a bullet." ”

University Monk: ".... Don't say so much, are you going or not? ”

The pipe shook his head and said: "Go ahead, there are so many nitrates, I want to build an automatic nitrification machine to improve the efficiency of nitrate." ”

Brother Dao nodded, "That's right, now sulfur and charcoal are easy to find, but the production of saltpeter can't go up." ”

At this time, Chen Yao was sitting cross-legged in the practice room of the study hall, continuing to absorb the Blood Eye Essence to improve his control ability.

From the combat effectiveness just now, he determined that the route of controlling the metal combat such as arc blades was promising, and continued to persist in research.

An hour later.

Chen Yao was preparing for a break meeting, and a prompt appeared in front of him: [Congratulations to the players on the island - Pipeline achievement achievement: [First self-made excellent blueprint] (the blueprint has been entered into the technology tree), rewarding the island with +100 thinking points]

Chen Yao was very happy, he didn't expect the buddy of the university monk to be so powerful, he called up the technology tree, and found that there was indeed a new drawing next to it:

[Lv.5 Drawing: Saltpeter Extractinator Type I]

[Drawing Grade: Excellent]

[Drawing cost performance: high]

From the idea of the drawing, it can be seen that the mechanical foundation of the pipeline is very strong, and there are many ingenious thoughts, and the final product is both practical and beautiful, and even the exhaust gas has a gas collection box.

Yes, very professional.

Chen Yao was also relieved at this time, and called Xiao Yinlong to send a hundred contribution points to the pipeline to help him exchange for a high-level helmet as soon as possible.

He thought for a moment, he couldn't fight an unprepared battle, and while it was still dawn, he simply went to explore the way and see what the lair of those Blood Apostles was like now.

Out of the study hall, Chen Yao saw that the pipe and the university monk were surrounding the painful breathing, and there were two iron jars similar to the size of kimchi jars around them.

"Hard!"

"Come on! You can definitely do it! ”

"Quick! Let's go inside! ”

Chen Yao: "......... What do you do? ”

The university monk turned his head and said with a smug smile: "Collect oxygen, you also saw during the battle just now, black powder fried insects are a bit overkill, if you can use firewood to burn insects, the effect will be better, but firewood burns too slowly, and the effect of providing some oxygen will be better." ”

Breathing painfully, her eyes closed, her hands condensed cyclones, and she could see that the proportion of gases in the air was divided into three categories, one was 78%, which was nitrogen, the second was 21%, which was oxygen, and the remaining 1% was the rest of the gases, which she couldn't control now.

She struggled to shove as much nitrogen into the tin pot on the left and oxygen as she pushed into the tin pot on the right.

"Quick, seal!"

The pipe immediately took out the lid and snapped it upside down on the jar, followed by pouring a circle of water over the edges.

"Goo-goo-goo."

After a few bubbles, the tin can quieted down.

"At the moment, we are short of resources, and water sealing is the most economical way to preserve gas."

Chen Yao nodded, pointed to the nitrogen and asked, "How are you going to use this?" ”

"There's no good way to do it yet. ”

"I know that nitrogen and oxygen can form ammonia under the action of lightning, and then it can be fused with water to form ammonia, which can be used as fertilizer at that time, and ammonia can also make nitric acid." ”

The university monk reacted quickly, "Nitric acid? When the time comes, with glycerin, you can find nitroglycerin explosives by adding some nitrocellulose, which is much more fierce than black powder. ”

"Glycerin is very easy to make, there is a lot of oil here, and it can be made by saponification reaction with caustic soda, and then there will be soap." ”

Chen Yao said: "Then the key is here, how to get lightning?" It could rain the day after tomorrow, but lightning was too hard to catch. ”

Breathing pain, he said helplessly: "I can only hope for the players who come later, oh, the warrior can awaken the lightning talent." ”

The university monk nodded and said, "Indeed, when everyone comes back, ask if you can recruit an old electrician to come in, even if you don't have lightning talent, you can use a transformer to make lightning." ”

The more they talked, the more interested they became.

Chen Yao stared at the nitrogen gas for a while, he had a new idea.

There is no oxygen in nitrogen, and if you inhale it, it will suffocate.

If you wrap the nitrogen with the spirit power ball, and then wrap the enemy, will you be able to suffocate the enemy to death?

The more he thought about it, the more he felt that he could, and pointed to the jar and said, "I want to take this jar and try it, and I will go to the lair of the Blood Apostle to explore the way, maybe it can come in handy." ”

The university monk took out a straw rope and tied it to the jar, "No problem, let's continue to build it here." ”

Breathing hurts: ".... It's whether I'm good or not. ”

Chen Yao smiled slightly, "Reward you with 10 contribution points, come on." ”

It hurts to breathe, and I immediately handed over the oxygen tank.

Chen Yao smiled: "This is not needed yet, you continue, pipe warrior, help me make a submachine gun and bullets." ”

The pipe nodded, took the material and skillfully operated it, and he was happy to do so, after all, he gained experience every time he built something.

The talent of metal affinity is not only reflected in the 10% increase in attributes, but more importantly, it improves his sense and understanding of metal, which can be used endlessly.

Soon, Chen Yao got the submachine gun, he looked around, and thought to himself that it seemed that he had to divide a shooting range, so many people always had to practice their guns.

Wait for the hero to come back to life, and then arrange for him to build some new buildings.

After setting his position, Chen Yao carried two hundred rounds of ammunition and nitrogen gas canisters on his back and rushed towards the location of the Blood Apostle's lair.