Despite the fact that the M-LOK rail covers are working on the Magpul Original Equipment (MOE) system, the two are incompatible. While an adaptor plate can be used to use newer M-LOK accessories on older MOE slot handguards, there is no adaptor for older MOE accessories on newer M-LOK handguards. Milspec Retail sells M-LOK rail coverings for sale at a reasonable price.