In early autumn, the peaks of southern Yunnan stretch endlessly. At a certain shooting range, a soldier concealed behind a barrier, extended the muzzle from the side, and used the "L" - shaped sight installed on the rifle to shoot at a distant chest ring target. After 5 gunshots, there were 5 clear bullet holes left on the target. This is Yan Xueqing, a Second Class Sergeant Major and Ordnance Technician from a certain brigade of the Southern Theater Command Army, testing his developed corner sight. Since joining the army, Yan Xueqing has been rooted in the grassroots front line, down-to-earth and devoted to research, deeply cultivating the infantry weapon maintenance profession for 21 years, gradually growing from a maintenance worker to a repair technician. He not only obtained the qualifications of "dual technician" for infantry weapon maintenance and sheet metal welding, but was also selected as a training object for "army craftsmen", and successfully applied for 4 national patents. He has been awarded as an excellent student and "four haves" excellent soldier multiple times, and has been awarded personal third class merit once. In 2004, 20-year-old Yan Xueqing enlisted in the military from his hometown in Sichuan. He secretly made up his mind to make a name for himself in the army. With his passion and stubbornness in his heart, Yan Xueqing plunged into the pile of parts for various weapons. In order to quickly master the basic knowledge of military equipment, Yan Xueqing faced difficulties and mixed weapon components together during the day, comparing, disassembling, and assembling them one by one, mastering the mechanical linkage relationship of various types of light weapons. At night, he repeatedly checked and studied various manuals. In just three months, he kept in mind the parameters, performance, and purposes of the light weapons belonging to the company, and successfully completed multiple light weapon shooting support tasks. In the first year of enlistment, he was awarded the title of "Outstanding Soldier" and received a commendation once. At the end of that year, Yan Xueqing suffered a comminuted fracture of his left middle finger due to an accidental injury, with 14 steel nails and 1 steel plate attached to the affected finger. The following year, Yan Xueqing, who was still in the recovery period, volunteered to participate in the military equipment maintenance professional competition after learning that his unit was going to organize it. Quick one second, one step closer to the championship! ”During the intense pre match preparation phase, Yan Xueqing repeatedly decomposed and combined various firearms, memorized theoretical knowledge, and even thought about the parts and assembly sequence of firearms while eating and sleeping... Hard work pays off. Yan Xueqing ultimately won first place in all individual events and overall events, but due to long-term high-intensity training, a steel nail in the affected finger broke and cannot be removed. He is also known as the "steel nail technician" by his comrades. What should we do on the battlefield? ”This is the most frequently mentioned sentence by Yan Xueqing. For this reason, he devoted himself to studying how to improve the combat capability of weapons and equipment, and the corner sight was one of his inventions. Once, Yan Xueqing learned about the corner sighting system in a report, which sparked his thinking as it could better preserve himself and eliminate enemies. It would be great if we could also use this system on the battlefield. But he found that the system was expensive. Can we develop a corner aiming system that is structurally simple, easy to maintain, and adaptable to a wide range of weapon types? Yan Xueqing began to explore: in his spare time after training, he searched for information through books, discussed with technical personnel in his spare time, and often consulted with professional personnel from manufacturers. After more than a year of hard work and with the cooperation of a state-owned factory, Yan Xueqing successfully developed a new type of corner sight with a cost of less than a thousand yuan. He was also selected to participate in the "Innovative Exhibition of Training Methods for Officers and Soldiers" organized by the Training Management Department of the Military Commission. Not long ago, after participating in the "Army Craftsmen" special training and returning to the unit, Yan Xueqing immediately shared the training results with the maintenance backbone of the unit. Class monitor, aren't you afraid of being surpassed one day when you teach us like this? "The disciples joked with him. One spirit is not a spirit, only one spirit can guarantee victory, "he said seriously. In recent years, Yan Xueqing has been invited every year to serve as a training instructor for military equipment maintenance backbone, cultivating many excellent professional backbone personnel. They have all become "experts" in the field of military equipment maintenance in the unit, shouldering major responsibilities and serving as the main force in grassroots units. (New Society)