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 12.5" rail system is ideal for long-barreled designated marksmen rifle AEG or gas blowback rifle platforms.