Weaver 93, I know they say 93a but the 93 works great and the screws are perfect size! The only thin is it only had 2 slots which works, but I took a file and made another slot. It took about 15 minutes and works. The mount was 9.00 and the height of the weaver combined with the factory stock and fastfire iii lines up perfect. The speed bead works I am sure but for 80.00 I am not beating this mount on an 1,800 gun!!!! Good luck