NTW-20反器材步枪有20mm和14.5mm两种口径,可通过更换枪管、枪机、弹匣和瞄准镜来进行两种口径的互换。20mm口径型采用二战德国MG-151型飞机机炮弹药,14.5mm口径型采用二战时苏联14.5mm高速穿甲弹药。该枪采用旋转后拉枪机式操作方式、无托结构。由于口径较大,其后坐力也非常大,除在枪口安装高效制退器外,枪管采用了浮置式结 NTW-20 anti-material rifle has 20mm and 14.5mm two caliber, by changing the barrel, bolt, magazine and sight to carry out two caliber interchangeable. 20mm caliber type World War II German MG-151 aircraft cannon ammunition, 14.5mm caliber used the Soviet Union 14.5mm high-speed armor-piercing ammunition during World War II. The gun uses a rotary pull-bolt operation mode, no care structure. Due to the larger caliber, the recoil force is also very large, in addition to the installation of efficient muzzle muzzle, the barrel using a floating knot