I'm looking for a PFD for a trip to Alaska, then possibly warmer areas such as the islands. The requirements are as follows.

22-27 pounds of lift
neck collar
Zip closure with two external belt closures with fastex buckles
Leg straps
covered with gear pockets like the old avirex pilots survival vests but clear on the sides for a pistol and large survival knife
3-4 liter hydration pouch on back
Internal pockets would be a bonus
heavy duty d rings

I've looked around but haven't had any luck finding one with all the features I require. Any help will be most appreciated.