I just bought a BSA red dot scope today. It has the weaver style mounting system and I need a mounting rail that will fit my 835. I bought one that was made by Leupold and it didn't work. The last 2 screw holes lined up good, but the front 2 did not. Also the screws the are on the scope didn't fit the rail properly on the front. Can someone tell me what kind of rail I need to get to mount this scope to my gun? Thanks in advance.