Capacity is the biggest problem.

Although it is only for factory acceptance, the test items will not be too many and will not be too harsh, but it will definitely consume a lot of ammunition.

You must know that before LAST was handed over to the U.S. military for combat testing, it had already fired 250,000 rounds of ammunition in factory tests.

Even if the test items are minimized, 50,000 test rounds should be prepared.

Because it can only be produced by hand, and only Chen Zihao and other technicians can participate, it is by no means an easy task to produce 50,000 rounds of test ammunition.

Zhao Yu and the others worked overtime and were busy for a month before they produced 50,000 rounds of test gun ammunition.

Bullets are cumbersome to make, but they are quick to use.

The acceptance test took less than a week.

In fact, the main test is performance, and it does not involve actual combat use, after all, D&F companies do not have that ability.

After the test was completed, BAE Systems technicians made a lot of comments and suggestions.

First of all, the diameter of the warhead can be further reduced, preferably less than 5 mm, such as 4.5 mm, after all, 6 mm is a bit too large for small-caliber bullets.

Reducing the diameter of the warhead, the benefits are obvious.

For example, it can reduce the mass of the whole bomb to less than 12 grams, or even control it within 10 grams; It can also increase the muzzle velocity and enhance the controllability of the firearm while reducing the muzzle kinetic energy; By increasing the length of the warhead and increasing the length-diameter ratio and specific kinetic energy, the penetration of the warhead can be guaranteed.

In addition, it is also of great help to reduce production costs.

Of course, Zhao Yu understands these truths.

In fact, Zhao Yu has long designed a 4mm countersunk bullet, but it is not a rifle bullet, but a pistol bullet.

Zhao Yu did not use a smaller caliber, not that it could not be done, but that it was not necessary, because Wang Dong did not think about helping BAE Systems win the OIC project.

As for the design of small-caliber pistol cartridges, they were aimed at submachine guns, not pistols.

According to Zhao Yu's judgment, after the popularization of head-sinking ammunition, small-caliber rifles are likely to be eliminated, and small-caliber bullets will not withdraw from the war stage.

Quite simply, apart from the infantry, other soldiers need better weapons for self-defense than pistols.

In fact, this is the PD concept that has been hyped up in previous years, and FN's P90 and H&K's MP7 are both products of this concept.

Although the PD concept has been abandoned by the military, the need for self-defense weapons among non-combatants has not decreased.

In addition, in some special cases, an automatic weapon that is shorter than a rifle, has sufficient lethality, and has a large enough fire density is also required.

In fact, this is the key to the widespread use of submachine guns that fire pistol cartridges.

If small-caliber rifles are withdrawn from the arena of war, while medium-caliber rifles are popularized, submachine guns that fire small-caliber bullets will also be valued.

With the help of countersunk technology, the small-caliber submachine gun of the future will certainly not be too bad.

To this end, Zhao Yu designed a 4mm countersunk bullet and began to develop a submachine gun on this basis.

It's just that the 4mm countersunk bullet and the new submachine gun are still PPT, and there are not even samples.

On the structure of the warhead, the technicians of BAE Systems also made recommendations.

It is best to use a tungsten carbide bullet core, and at least a tungsten carbide bullet core warhead should be developed to improve the lethality of protected personnel.

In fact, the price of tungsten carbide has long been reduced, and it has long been popularized.

More than 10 years ago, Russia was the first to use tungsten carbide cores on 5.45mm bullets, which greatly improved the penetration performance of bullets.

In addition, the U.S. military has also developed 5.56mm bullets that use tungsten carbide concerns, but only for special forces.

For Zhao Yu, developing a warhead with a tungsten carbide core is not a matter at all.

Don't forget, on the 6.6 mm bullet and 8.8 mm bullet, Zhao Yu has long tested the tungsten carbide bullet core, and also developed the 7.62 mm NATO bullet using the tungsten carbide bullet core, and delivered it to the Saudi special forces, and its actual combat proved to be extremely good.

Tungsten carbide bullet cores were not used, and the reason was to reduce costs.

The use of tungsten carbide cartridges will certainly increase the manufacturing cost of gun cartridges, and the OIC project is aimed at the M4/M16, which will be equipped with the US Army in the future, so the cost of gun cartridges is crucial, and even a few cents more bullet will cost billions more than decades of use.

Of course, as long as there is a need, the development of a gun cartridge using a tungsten carbide core is not a problem at all.

While putting forward opinions and suggestions, BAE Systems technicians also affirmed the 6mm submerged bullet and gave pertinent conclusions.

That is, the 6mm countersunk bullet can be used to participate in the OIC project selection.

Of course, there is even greater hope if improvements are made in response to the issues raised.

As for the firearms in question, they are not within the scope of cooperation between the two companies.

This is also understandable, i.e., the bullet is first determined, and then the firearm is designed to fire the bullet.

If you don't even have a gun, it doesn't make much sense to design a firearm.

After the technician submitted the report, Serena went to London again to discuss the follow-up cooperation with Lawrence, that is, the contract.

This time, Lawrence was not so cheerful and asked two questions.

First, when will D&F company be able to mass-produce 6mm countersunk bullets, at least it must have mass production capacity, after all, to participate in the selection of the US military, a large number of tests must be carried out, and it is necessary to produce enough bullets, in addition, mass production capacity and mass production price are important indicators for model selection.

The second is whether D&F can come up with a firearm that fires 6 mm countersunk bullets in a short period of time, preferably a complete squad gun family, and the performance at least meets the basic standards proposed by the US military, and uses a complete set of shotgun systems to participate in the OIC project selection competition.

The key is the first question, after all, the 6mm countersunk is unique to D&F.

As for firearms, it was a secondary issue, and Lawrence made it clear that if D&F didn't have the ability, he would consider working with other companies.

To this, Serena also gave a clear answer.

D&F does not have the capacity to mass-produce 6mm countersunk shells for the time being, but it will certainly be able to solve the problem in the near future, that is, the first ammunition production line for 6mm countersunk shells is already in preparation, and it will be ready for trial operation early next year at the latest, and it will be fully operational by the middle of next year.

As for firearms, Serena proposed that D&F could self-finance the design of a rifle that would fire a 6mm countersunk cartridge in accordance with the standards of the OIC project, and then submit it to BAE Systems for acceptance testing. If accepted, D&F participates in the OIC project as a Tier 1 contractor. If it is not adopted, BAE Systems has no loss, i.e. the development costs are paid by D&F.

Serena also hinted to Lawrence that D&F would participate in the Saudi Army's tender with guns fired from countersunks.

In other words, even if it is not selected by BAE Systems to participate in the OIC project, D&F will be able to earn back the development cost by relying on the Saudi Army's order.

At this point, all the problems have been solved.