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Airsoft M4 AR Metal receiver (Fullly licensed trademark)

Carefully selected by our chief engineer (Phd.) and tested by ECHO1's chief technician.

One year, yes. We developed this product for 1 year already. The designer is the same designer of UAV. A twelve scientists team from Taiwan college. The MadBull tracer is totally different from other tracers in the market. It is designed from scratch. Our first design was using LED as the light source but we found out LEDï¾’s power is far less than flash. Especially when BB travel through the short distance tunnel, there is not much energy transfer to the tracer BB. The final version is using flash light which is the same idea as Japan made one about 15 years ago. However, we are applying new modern technology, such as ﾓenergy savingï¾”, ﾓlight up more BB per secondï¾”, ﾓUSB chargerï¾” and of course, Gemtech licensing. Enjoy MadBull new tracer unit! Remember to use MadBull tracer BBs! (Green and Red tracer BBs)

One year, yes. We developed this product for 1 year already. The designer is the same designer of UAV. A twelve scientists team from Taiwan college. The MadBull tracer is totally different from other tracers in the market. It is designed from scratch. Our first design was using LED as the light source but we found out LEDï¾’s power is far less than flash. Especially when BB travel through the short distance tunnel, there is not much energy transfer to the tracer BB. The final version is using flash light which is the same idea as Japan made one about 15 years ago. However, we are applying new modern technology, such as ﾓenergy savingï¾”, ﾓlight up more BB per secondï¾”, ﾓUSB chargerï¾” and of course, Gemtech licensing. Enjoy MadBull new tracer unit! Remember to use MadBull tracer BBs! (Green and Red tracer BBs)

The MK1 series, developed by Primary Weapons Systems, is a significant product improvement for the M4/M16-type carbines and rifles. Utilizing our proven long stroke piston system, the MK1 series greatly reduces fouling in the action of the weapon making it as reliable as the AK47 that it was designed after.