大口径狙击步枪一般指12.7毫米以上口径的狙击步枪。其打击的目标是:轮式和履带式轻型装甲车、卡车、停机坪上的飞机、正在降落的或未加屏障保护的直升机、雷达站、班组武器、主战坦克的外露设备、指挥所和通信设施等。70年代,美国军械研究工业公司研制了12.7毫米500型大口径狙击步枪,开了大口径狙击步枪的先河。此后,不少国家纷纷仿效,推出了不少这类狙击步 Large caliber sniper rifle generally refers to more than 12.7 mm caliber sniper rifle. Its targets are: wheeled and tracked light armored vehicles, trucks, airplanes on tarmac, helicopters being landed or unprotected, radar stations, squadrons, exposed equipment for main battle tanks, command posts and communications Facilities and so on. In the 1970s, the United States Ordnance Research Industries developed a 12.7 mm 500 large-caliber sniper rifle and opened the door to large-caliber sniper rifles. Since then, many countries have followed suit and introduced many such sniper rifles