PWS?I assume your M4 was originally a standard M4 with DI (direct impingement) gas system with standard front sight tower, so ARES kit is most likely the one you install.

• PWS?既然你说你的枪是M4，那我猜应该是标准有准星座的气体直导式AR改过来的，所以最有可能的应该是ARES的改装套件。