The FX modified bracket is designed to the fit into the lower section of the FX M3 Impact and FX Maverick ( with minor modifications) and mounting. The lower part of the center recoil pad needs to be cut to make space for the bracket (0.750 removed). The FX bracket can then be slid into place and mounting holes need to be added to properly support the Bracket. See images. Lower part of the bracket is a standard Picatinny Rail. Non-Affiliation Disclaimer. We are not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Eliseo Rifles.