HAO's Cylinder spring are made by SWP-B Spring(Cold-drawn Steel Wire for Mechanical Spring).


  • MPS/FPS conversion : ( calculate  with 6mm 0.2 BBs)
  • M90  = 296.00 FPS = 0.81J
  • M110= 361.84 FPS  = 1.21 J
  • M130= 427.63 FPS = 1.69 J
  • M150= 493.42 FPS = 2.25 J

Main Cylinder Spring M90/110/130/150


Term Of Use:
All the products are made and design for Airsoft use. Any modification of structure, exterior, appearance or painting, marking or wiping the cover/instruction on the merchandise may lead to violate your nation's law regulation. Customers shall bear the full legal liability after the modification.