Active breaking systems for airsoft are also now being on top of the list of many serious airsofters. This item at RSOV.com can be had for discounted price of US$14.39... "Hornbill MOSFET active braking unit for M4 AEG. Modified version with Telfon sleeved wires able to carry higher current and higher temperature than normal PVC insulation wires.

• MOSFET PCB x1 (with battery connector)
• Red wire with male connector x 2 (19cm)
• Red wire with female connector x 1 (24cm)
• Black wire with male and female connector x 1 (41.5cm)

Please check out the instruction as below photos to show that how to install."