The pendulum sight with two fixed pins you are refering to is most likely the "SNIPER" fixed pin/pendulum from TOXONICS. It may be ordered in a number of configurations. Meaning you can get this model with a tooless gang ajust, dovetail removeable extension or even an extention bar with the MATHEWS HARMONIC DAMPENER. Its part of a modular sight line you can see at www.toxonics.com click the 2003 catalog preview to see the new stuff.