Ava's assembler is an upgraded version of Ava's accumulator, requiring completion of Dragon Slayer II to obtain and use. It can be upgraded by taking Vorkath's head, 75 mithril arrows, and either 4,999gp or Ava's accumulator to Ava in Draynor Manor. It provides the best in slot ranged attack bonus for the cape slot, as well as being the only cape slot item that provides a ranged strength bonus.
Ava's assembler requires level 70 in Ranged to wear, and can randomly gather mithril ranged items. It also has an 80% chance of saving ammunition compared to the accumulator's 72%. Due to the remaining 20% being the chance for ammunition to break, the assembler does not drop ammo on the ground.