The release of U29.5 Deimos: Arcana also brought two new Kitgun Chambers, the Vermisplicer (left) and Sporelacer (right). Like with the existing Chambers, they can be made into distinct Primary and Secondary versions, though will only offer a single set of Mastery. There are also two new Grips, and four new Loaders. These components are all cross-compatible with any of the existing Kitgun components.
Oddly, although the new Infested component blueprints are all purchased from Father in the Necralisk, you cannot build any Kitguns with him. Instead, you still need to go to Rude Zuud in Fortuna to assemble a Kitgun (for 5000 credits), as well as Gild them (for 5000 Fortuna Standing and 10 Shelter [second tier] Bonds).
EDIT 18/12/2020: As of U29.5.7, you can now also build Kitguns at Father, as well as being able to guild them for 25 Father tokens.