The Big Dragon MI M-LOK RIS System allows Magpul M-LOK System rail sections and accessories to be directly mounted to the rail system. The M-LOK system is Magpul's evolution of their original MOE accessory system in an attempt to make their mounting system even more universal. In addition to the M-LOK slots this rail system also has standard 20mm Picatinny/Weaver mounts along the top of the rail system for mounting nearly all aftermarket iron & flip up sights as well as optics such as red dots or scopes. This all aluminum rail system also has multiple QD sling mount attachment points as well as includes a free-float receiver lug nut compatible with most AEG and GBB airsoft rifles. This 9" RIS is all all around good fit for more standard to longer barrel length rifles and will provide ample space to mount multiple aftermarket accessories.