模块化设计已经成为枪械的设计主流,并且这种设计从过去的零部件通用升级到使用者根据战术需要选择不同的零部件组合。当然,模块化设计对于枪械工艺提出更高的要求,即可换装的枪管、枪机、套筒、弹匣等部件要达到极高的制造要求,以使部件更换后射击顺畅而不发生故障。SIG公司推出的SIG 556Xi突击步枪不仅令使用者可以按照战术需求选择部件,甚至还能够在美、俄弹药口径之间转换,将模块化设计更推进一步—— Modular design has become the mainstream design of firearms, and this design from the general upgrade of parts to users according to tactical needs to choose a different combination of parts. Of course, the modular design of the firearms craft put forward higher requirements, that can be refitted barrel, bolt, sleeve, magazine and other components to achieve high manufacturing requirements, so that after the replacement part of the shooting smoothly and does not happen malfunction. The SIG SIG 556Xi assault rifle not only allows users to select components according to tactical needs, but also to switch between caliber of the United States and Russia ammunition to take the modular design one step further -