MechLabs Roto Pro CNC Buckingless Hop-Up Chamber for HPA Engines HIP UP UNIT Piston head weight 2

Piston head weight 2

For M170 spring and other high power upgrade

independent poppet and nozzle design that sets a new standard for a drop in kit

Internal BB retention mechanism reduces BB loss during magazine changes

MechLabs Roto Pro CNC Buckingless Hop-Up Chamber for HPA Engines HIP UP UNIT Piston head weight 2Bucking less design eliminates traditional hop up rubber entirely Micro injected precision nub replaces bucking for backspin generation Enlarged contact surface improves BB stability and Magnus effect Extreme shot to shot consistency, especially in HPA builds High durometer nub material resists wear and deformation Eliminates common bucking issues (tearing, swelling, misalignment) Mechanically indexed self alignment system for perfect positioning