Power/Precision build
Yes.
Don’t neglect your vitality and toughness, though.
Power is good and will lead to the best overall damage with a rifle, however, you might consider traiting down the Tools line for the Crit %. In my experience, having up to 2.5K auto-attack crits (hip shot) puts opponents under pressure very quickly which leads to mistakes. The overall damage per second (with the rifle) is a bit less than traiting for power in the Explosives line.
You can gear your crit % into the 90’s with Berserker Armor, Ruby Jewels/trinkets and a berserker weapon.
While it’s expensive (4+ gold) the Bloodlust Sigil will gain back the lost power, so long as you can stay alive long enough to build kills. So for survivability, you need to pick some escape options like Elixer S, Slick Shoes, etc.
This is the build I am currently running (and I’ve experimented with quite a few) and I am very happy with it for WvW. I haven’t done any sPVP with it, so cant comment on that side.