What model spring did you specifically use? Would this work on a QA?The only modification I've made to my P99 AS was to replace the factory striker spring with a lighter Wolff one intended for a Glock. It was a drop-in fit, and reduced the weight of the trigger pull noticeably.
What does the BA-5 look like? I see the BA-6 here but not the BA-5:I'd love to find a BA-5 for mine, I like the profile that it creates for the P99 that the BA-6 just doesn't seem to do. Wouldn't mind a threaded barrel and half-decent suppressor/silencer for it too, but for the cost of those two plus the tax stamp I could just buy a Colt Python which I covet more than making my gun quiet just for the fun of it.