We are now including 3 sets of screws with all Aimpoint T1/T2 mounts. The short screws are for our one piece mounts. The Middle length screws are to be used with our 2 piece modular risers as well as mounting the Aimpoint T2 on one of our one piece bases. ( The T2 requires the use of longer screws for proper thread engagement. )The longest length are to be used with our two piece risers with the Aimpoint T2 optic.