- 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.
Here at Patrol Base we ship worldwide, delivering not only to the UK but to most of the EU and select Worldwide locations as well. We provide a working day-by-road service via our handpicked courier services, simply buy your Airsoft guns with us and we'll have them delivered directly to your door.
For more information and to see the country we deliver please check out our Delivery Information Page.
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK Next Day
Highlands / Islands
* Scottish Highlands, Islands, and EU post prices can vary wildly. Prices range from £8.99 to £29.99, so please ensure you refer to the Postage Calculator at the basket for the lowest possible price.
We want you to be delighted with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
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
- Nautilus Gear Box
Internal Part Type
Weight and Dimension
Internal Part Construction
Polymer, Alloy, Silicon,
Part for Power Source Type
M4 / AR-15 / M16
Electric Part Specific
Gearbox Version Compatibility Variant
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!
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.
For more information with fitting parts, or should you require help, feel free to get in touch with our Workshop Department via our Contact Us Page.