KRYTAC Nautilus Gear Box

Code: KTP-KA001-00A
  • Integrated MOSFET
  • Lube / AOE Window
  • 8mm Bearing Gearbox

A complete gearbox built to Krytac's high standards, which is ideal as a replacement for Krytac models or for transplanting into other Version 2 compatible weapons for Krytac level performance.

Full description


This complete gearbox is ready to drop into any Krytac rifle as a replacement, or to transplant into any Version 2 accepting RIF for unmatched levels of out-of-the-box performance. Krytac are well known for their commitment to quality and this ready-to-install gearbox is no exception. It features an integrated MOSFET for electrical protection, 8mm bearings and Krytac's usual heat treated gears for exceptional longevity. The whole shell has been designed for structural integrity, ensuring there are no weak points which will cave to stress during firing. The quality extends to the components included inside such as the piston which has metal teeth, the second to last of which has been removed to ensure proper and efficient engagement. The cylinder head features a thick rubber pad to aid in quieter operation and longer lasting performance. The spur gear features Krytac's usual higher tensile spring to maintain better engagement, especially when under stress. Other neat features of this complete package are the window on the side of the case which is ideal for the application of lubrication, and to check on internals without going through the stress of opening it up. A quick change spring system means that you won't have to completely disassemble the unit to change the main spring of your weapon. Whether you need a replacement for your precious primary, or want to shoehorn Krytac levels of durability and performance into any Version 2 accepting RIF, this gearbox is a surefire choice.


  • Integrated MOSFET
  • 8mm bearings
  • Window on side of gearbox
  • Gearbox shaped for max durability
  • Quick change spring system
  • For Krytac / other Version 2 RIFs
  • Heat treated Steel-Alloy gears
  • Tough Sector gear spring
  • Tooth removed from Piston for better engagement
  • Thick pad on Cylinder Head
  • High durability gearbox
  • Complete and ready to drop in
  • Excellent cable routing

Package Includes:

  • Nautilus Gear Box 



Internal Part Type
Complete Gearbox
Patrol Base - Warning Icon
Upgrade Parts

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.65kg


Colour Wheel Greyscale
Item Colour
Silver, Brass,
Construction Icon
Internal Part Construction
Polymer, Alloy, Silicon,

Part Specific

Part for Power Source Type
Weapon Platform
M4 / AR-15 / M16
Package Includes
Complete Gearbox

Electric Part Specific

Gearbox Icon
Gearbox Version
V2 Gearbox
Gearbox Version Compatibility Variant
Version 2

Size guide

Parts Fitting

Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff. 

Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.

We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!

Unique Parts

Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.

Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.

If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.