I shot this over the shooting chrony today, I had thought the right barrel was going to be faster, it just feels like it has more kick or noise or something, I know the main spring is quite a bit stiffer on the right so it may be in my head because of that.
But after shooting it over the chronograph both barrels shoot the same.
20 shots (10 from each barrel) there was no difference in barrel speeds but it did range from lowest 1125 to highest 1160 fps. The rest were randomly in-between those numbers. The box says 1080fps