Paragon Spec Fully Upgraded Drop-in Gearbox (V2)

Grip Color

A fully upgraded gearbox that is truly "drop-in ready". Each part is carefully selected to extract the utmost performance and reliability. The motor and grip are included which eliminates the need for the user to adjust the bevel to pinion shimming. Simply remove your old gearbox, install and align the Paragon Spec gearbox, attach the grip, and drop the motor in. Each gearbox is made to order with an average working time of 5 hours. We ensure each gearbox is perfectly tuned to exceed your expectations. Because each gearbox is built to order, our current lead times are 3-4 weeks.

PAIR with our R-hop Drop-in Units for unmatched range and accuracy.



 18:1 DSG

22 TPA 25,000 RPM

300 - 350 FPS (0.2g)



 14:1 SSG

18 TPA 28,000 RPM

375 - 400 FPS (0.2g)



 10:1 SSG

28 TPA 19,000 RPM

375 - 400 FPS (0.2g)



  • Retro Arms Billet Aluminum Gearbox Shell
  • JeffTron Leviathan Optical Programmable MOSFET
  • *Siegetek Cromoly Gearset ("Balanced" and "High Speed" variants)
  • *Rocket / SHS bevel + spur and Siegetek 8T DSG (Applies only to "Ultra High Speed" variant)
  • Paragon Spec CNC Motor
  • Paragon Armory 8mm Stainless Steel J Caged Bearings
  • Full Metal Rack Piston AOE corrected
  • POM Piston Head with bearings
  • Guarder Oil Temper Wire Spring
  • CNC Double O-ring Cylinder Head
  • Guarder Tappet Plate
  • VFC M4 O-ring Air nozzle (21.25mm)
  • Stainless Steel Cylinder
  • Hardened Steel Anti Reversal Latch
  • Retro Arms M4 Selector Plate
  • PTS EPG-C Pistol Grip


  • The images are for demo purposes only and may not 100% represent the final product. Please refer to the above parts list for the most accurate and up to date specs. 
  • Compatibility and final results may vary. Some experience is required. 
  • Confirmed fitment with: VFC, Cyma, G&G, King Arms and other same spec lower receivers.