Laylax shows the Nineball Glock 17 Gen5 MOS Mount Plate for the Tokyo Marui G17 Gen5 MOS to allow owners to mount RMR or ACRO sights instead of the Tokyo Marui Micro-Pro Sight. This video demonstrates the installation of ACRO and RMR mount plates onto a Tokyo Marui G17 Gen5 MOS gas blowback gun. These plates enable users to attach dot sights other than the standard micro-pro sight. The video showcases how to mount various optical devices compatible with ACRO and RMR foot plates, including OLIGHT's OSIGHT for RMR models. Please note that additional screws may be required depending on the chosen optical device.