ULTIMATE M150 Spring Type_3-9x40 These coupler clips are used

These coupler clips are used to hold two magazines together for fast reloading

Adjustable hop-up is incredibly accurate

Standard 20mm weaver rail for all kinds of scopes

Suitable for WE's Compact M&P model

Perfect for airsoft technicians and other professionals alike

ULTIMATE M150 Spring Type_3-9x40 These coupler clips are usedHigh quality spring from ULTIMATE. These are double progressive springs which make sure the torque of the motor is used to its full extent, giving a higher rate of fire. This spring is chromium plated which minimizes the friction of the spring on the piston. Black in colour. Chromium plating also does not wear or chip leaving debris in the gearbox like paint treated springs. M150 produces approx 490fps, suitable for use in UK European games.