In fact, it is no wonder that Bai Yi will sigh, if you want to trace back to the source, this bolt assembly in Bai Yi's plan is really quite related to the SVT-40 semi-automatic rifle of the Soviet Union, because this bolt assembly is improved with reference to the bolt assembly in the famous Type 56 semi-automatic rifle in later generations. Pen "Fun" Pavilion www.biquge.info

The Soviet SKS semi-automatic rifle copied from the Type 56 semi-automatic rifle was designed after fully referring to and absorbing the advantages of the SVT-40 semi-automatic rifle.

At least in terms of structure, Bai Yi's scheme of absorbing the Type 56 semi-automatic bolt assembly is much simpler and more reliable than the bolt assembly of the original SVT-40 semi-automatic rifle, and you must know that although the SVT-40 semi-automatic rifle is used, it is also a bolt offset locking mechanism.

However, due to the historical conditions at that time and the limitations of the designer, the composition of the bolt assembly is still a little complicated, the most typical is that the bolt frame of the SVT-40 semi-automatic rifle is designed as a groove that requires precision machining to make, and this groove is used to drive the bolt below to achieve an offset opening and closing lock.

However, the Type 56 semi-automatic rifle reduces this complex bolt assembly to a pair of hooked stoppers, which not only reduces the machining workload by nearly two-thirds in production, greatly saves production time and costs, but also improves the durability, service and reliability of the simplified bolt assembly by leaps and bounds.

Because of this almost open hook-like closure device, it can almost be immune to severe cold, sand, mud and other harsh substances and environments, not to mention anything else, the Chinese army's Type 56 semi-automatic rifle in those years was as far north as the bitterly cold Saiwai, south as far as the wet and cold tropical jungle, to the west deep into the desert Gobi, and to the east in the south of the Yangtze River, where the water network is dense.

Standing guard on the plateau, touching fish in the mud, from south to north, from east to west, the Type 56 semi-automatic rifle has accompanied the Chinese army for nearly 30 years, and has almost never been able to fire due to bolt failure.

Because of this, Bai Yi's use of the bolt assembly of the Type 56 semi-automatic rifle can be said to be the best choice that is both mature and reliable, but the use of the 56-like bolt components, but Bai Yi did not copy the Type 56 semi-automatic rifle, the reason is also very simple, the 56 semi-automatic rifle is only a semi-automatic rifle after all.

Therefore, Simonov, the designer of the original Soviet SKS semi-automatic rifle, did not leave any room for modification at all when developing this gun, but only designed it as a pure semi-automatic rifle, and because of this, the Type 56 semi-automatic rifle is very good in all aspects, but it is not suitable for improvement into a fully automatic rifle.

As for its bolt assembly, it is the same, because it is semi-automatic, and does not involve the problem of continuous movement of the recoil, so the 56 and a half bolt support point is located in the front section of the firearm, but the fully automatic firearm developed by Bai Yi can be fired continuously, if the bolt support point is at the front end, it is likely to be unable to withstand the impact of continuous shooting, resulting in damage to the bolt and scrapping of the whole gun.

So Bai Yi took another classic bolt offset automatic rifle, the FAL automatic rifle developed and produced by Belgium, and fully absorbed the structure of the bolt support point backwards, and at the same time redesigned the receiver, and then simplified the production process of each link, which formed the final plan on today's notebook.

"Uh...... Before joining the Soviet Army, I studied in the Soviet Union for a period of time and worked as an intern in a factory for three months, during which I came into contact with a lot of firearms developed by the Soviet Union and absorbed a lot of beneficial nutrients......"

Bai Yi naturally can't say anything about the guns that will only appear in a few years, but in the face of the admiration of Wang Dehua and others, Bai Yi also needs some explanations, and he is already familiar with this, and he is even more blushing and heartbeat, the people present have long been convinced of Bai Yi, and Bai Yi's return from the Soviet Union is not a secret, so Bai Yi's words were quickly accepted and recognized by everyone.

In the next three months, Bai Yi and others almost threw themselves into the No. 5 workshop, repeatedly scrutinizing every detail of the new firearms, simplifying as much as possible, and never using complex production methods to manufacture those that can be manufactured with simple processes.

At this point, Bai Yi, the traverser, does not have more ways to produce these experienced old technicians around him, for example, in the production of small parts such as air hoops and rulers, Bai Yi only knows how to use machining, but due to the proficiency of workers, as well as the accuracy error of the existing machine tool and other factors, the scrap rate of these small parts is very high.

Bai Yi thought of a lot of ways for this, but how can not reduce the rate of products, this problem was then solved by the old fitter Master Lei, and the method he used is very "earthy", because China has been widely used in the pre-Qin period of this process, thousands of years, this set of technology is about to improve to the present, that is the lost wax casting method.

Lost wax has been used in the manufacture of precision instruments since the pre-Qin period, at the end of the seventies out of the tomb of Marquis B, there are several national treasure-level bronzes, which are cast by this lost wax process, therefore, this set of technology in China's inheritance of more than 1,000 years, has been improved by generations of skilled craftsmen, and has now become a set of extremely mature precision casting process.

It's just that this set of technology was only used in the feudal era for the manufacture of complex and exquisite handicrafts, and now it is introduced into the production of weapons and equipment by Master Lei, the process is also very simple, as for the effect is even more obvious, the use of lost wax casting method to cast precision parts, even if the resulting parts can not meet the requirements temporarily, can be used normally after simple machining.

The process is simple, the application is mature, the older generation of craftsmen can be proficient in operation, and a little machining process also makes the process greatly simplified, and more importantly, the scrap rate is controlled within a very small range, because of this, Bai Yi simply casts the casing with this lost wax method, although the life may not be as long as machining, but it can not stand its low production cost, fast production efficiency, and more importantly, the scrap rate is very low, and this is particularly precious for China, which is short of resources and materials......