I have a bt99 when i have the gun where i like it and i'm hitting targets. I see about 21/2 inchs of rib between the beads.I'm having a hard time getting the gun in the same spot i have doubles gun with a higher rib everthing lines right up .The bt99 does not have an ajustable comb on it.So do i go with an add on or new rib moneymakers can do it for $365 and they are just down the street.