ORIGINAL: Tommygun
Today I weighed the model with the YS .45 and pipe, and threw all the radio gear on top of the wing to get an idea of the all up flying weight. Rough estimate- comes out to about 5.5 lbs all up. The .45 is actually big enough to fit right on the rails with no mods- it may even use the existing holes!
At 5.5 lbs and a piped YS 45 you should be good to go for ballistic vertical. Be careful of your CG with the light engine.