Haven't handled one in years, say earlier 90s. Think of an AK gas system combined with a AR lower. The miliarty versions are the K1 and K2 are the standard service rifles in South Korea. They work fine or the ROKs wouldn't use it. However, spare parts and accessories are few and far between. Does use M16/AR15 magazines and the DR200 is the semi version of the K2 with a 1:7.3 twist.
CD