This forend tube is not compatible with AXSR rifles. It is also not compatible with any AICS chassis systems.
M-LOK 16″ Forend Tube for the AI AXMC and AX Rifle Systems (post 2014). AXMC rifles will require a 20 MOA action rail to align the picatinny rail interface.
Integrated 20 MOA Picatinny Rail
RRS Dovetail Standard