"We're being targeted, the Suburban in the back."

"Yes, it's MI5."

Tiehu was slightly stunned and said, "Shake it off?" ”

"No, pretend you don't know."

Although he was a little worried, Wang Dong's calm and calm appearance reassured Tie Hu, after all, they didn't do anything against discipline.

Because more than 20 operatives returned together, Wang Dong did not let Zhao Yu send someone to pick them up.

Coming out of the parking lot of the airport, Wang Dong found the Suburban, several to be exact, and the cars were full of MI5 agents.

MI5, MI5, which is primarily responsible for internal security, is a sibling unit to 007's maiden home, MI6.

With so much going on, it's normal to be targeted by MI5.

This shows that the British intelligence agencies already know about Wang Dong's experience in Saudi Arabia, or at least know that they saved the Saudi crown prince.

But what's there to worry about?

Wang Dong was a personal bodyguard, and Serena was present at the time, Musharraf remained in Riyadh, and the British authorities had no reason to deal with them.

Based on the relationship between Britain and Saudi Arabia, especially the relationship between the British royal family and the Saudi royal family, the news of this matter spreads, and the Queen of England may give Wang Dong a knighthood.

Just as Wang Dong judged, those MI5 agents were just tracking.

After Wang Dong and the others arrived at D&F's headquarters, the Suburban left, and the other vehicles piloted by MI5 agents did not appear.

Half a year ago, after receiving an order from the Saudi special forces, D&F rented the entire building.

Actually, it's not that big, counting the two basement floors, it's only seven floors in total.

The company's business is all in charge of Serena, and there is no need for Wang Dong to worry about it, he went to find Zhao Yu.

Although the R&D center has been established, no suitable place has been found, so two floors of the company's headquarters can only be set aside as a temporary place.

Countersunk shells of three calibers have been designed, and a batch of ammunition for testing has been made.

In addition, Zhao Yu made several test firearms.

Strictly speaking, it is not a gun, but a firing mechanism, which has the function of firing bullets, but it certainly cannot be used as a firearm.

It's simple, too big, too heavy.

Although it is not the final production of the bullet, there are still many problems to be solved, such as the structure of the warhead has not yet been determined, but through the live fire test, the previous theoretical calculations have been proved, that is, the performance of the countersunk bullet with binary propellant is far superior to that of any existing one-bell bullet.

Some performance indicators even surpass the submerged bullet developed by Textron for LAST.

In Zhao Yu's words, by making a fuss about the warhead, the performance can be improved a lot, so as long as mass production is achieved, it is absolutely unique.

"When is the energy produced?" Wang Dong is also very direct.

Zhao Yu pursed his lips and looked at Chen Zihao next to him.

Wang Dong's gaze also turned to Chen Zihao.

"The propellant used to make the sample ammunition came from the Military Intelligence Agency, and we only mastered the manual loading technology, and the production technology of the propellant and the industrial production technology of the gun and ammunition are all in the hands of domestic enterprises." Chen Zihao sighed and said, "If the bureau doesn't agree, then it's no fun." ”

"We can't figure it out ourselves?"

"Although the composition of the propellant is not a secret, there are so many problems involved in industrial production that at least it requires cooperation with large chemical plants. The principle of the stack spraying and filling process is not complicated, and the problem is that the equipment required for industrial production can only be provided by large equipment factories. In addition, we do not have drawings, so we cannot place orders with the equipment factory, and the bureau will certainly not provide equipment drawings. ”

"Trade secrets?"

Chen Zihao nodded and said, "It's not just a commercial secret, it's also a military secret, after all, it's used to produce advanced guns and bullets." ”

"So, there is no other way than to cooperate with the 'Xinbao' group?"

"If we have enough time, let's say five or ten years, we might be able to master the technology. It's just that by then, I'm afraid there will be no need for this. ”

Wang Dong sighed, Chen Zihao was not wrong, it dragged on for five years and ten years, and the daylilies were cold.

"Actually, the key is in the game." Chen Zihao hesitated for a moment before he said, "Before I came over, the 'Xinbao' Group had already built the first gun and ammunition production line, and the propellant had also begun to be produced in small batches. So far, there has been no public information, just because it has not yet passed the military acceptance. As long as the bureau agrees, we can directly purchase the production line, and the most important propellant can only be imported from Huaxia for the time being. ”

Wang Dong nodded, indicating that he understood what Chen Zihao meant.

"Comparatively speaking, the level of secrecy of the technology for the production of countersunk bombs is much lower. Unsurprisingly, Textron will soon transfer the license for the production of countersunk shells to American ammunition companies on a licensed basis. As long as the OIC project continues to move forward, mass production must be considered. In fact, as far as I know, before handing over LAST to special forces for combat testing, American ammunition enterprises began to produce submerged shells in small batches. ”

"What do you mean......" Wang Dong looked at Zhao Yu.

"We applied for export to Saudi Arabia, and it should not be difficult to get the production line of the buried bomb, but the propellant must be imported directly."

"I'll take care of this."

Zhao Yu nodded and didn't dwell on this question again.

"What about caliber?" Wang Dong changed the subject.

"The test bullets produced now are only to verify the technology of countersunk ammunition, as well as the performance of binary propellants, and there is no caliber standard."

Wang Dong was slightly stunned, Zhao Yu didn't say much, and left the opportunity to Chen Zihao.

"In fact, the military has not determined the caliber standard, so the acceptance work has been delayed for so long. As far as I know, the military is still weighing the performance metrics of the new guns. ”

"So, there's no reference standard to draw on?"

Chen Zihao nodded, indicating that this was what he meant.

"Well, we'll have to guess." Wang Dong smiled bitterly and sighed, and said to Zhao Yu, "You are an arms expert, what do you think?" ”

"This ......"

"I said it, just guessing."

"From the structural point of view, there are three main caliber standards for countersunk shells, one is the diameter of the warhead, the second is the length of the cartridge, and the third is the diameter of the cartridge. Because the warhead is placed inside the cartridge, the length of the warhead is extremely relaxed, as long as it does not exceed the length of the cartridge. In order to improve the performance of the bullet, such as the muzzle kinetic energy, it is necessary to load more propellant, and the mass and size of the bullet will inevitably increase. In order for soldiers to carry more ammunition, enhance their sustained combat effectiveness, and reduce the burden on soldiers, the quality and size of bullets must be strictly controlled. This is a contradiction, any bullet has it, compared with traditional bullets, the countersunk bullet is just not too prominent, it does not mean that there is none. ”

"And then?"

"In my analysis, the general trend is to make a fuss about warheads, by adopting different warheads to change the performance of the bullet and respond to different tactical needs."

"Complicated?"

Zhao Yu nodded, this is indeed a very complicated, and it can also be said to be a very profound technical problem.