I have noticed the same thing with my barrel break. You just have to try harder to single fire and apply 1/2 of the normal pressure to fire the 1st dart. It is a whole lot easier to just fire both at the same time though.
I might just cut off the entire bottom grey piece if I decide to make the recon stock a power stock, that is if I have the time. After this week, I'm back into the long hard year of school and sports.
Yes it is but I don't have big hands so this mod is perfect. Now my alpha trooper can have a 35 dart mag and a spare 18 dart mag in the stock waiting to be used.