The Calico Jack got an M4 series under the Matrix brand available at Evike.com. This features the new "Falcon" version 2 gearbox, complete with quick change spring, 8mm steel bearings, and a rotary-style hop-up. With the Falcon electronic control system you can control fire mode and trigger pull as well as provide battery and motor protection. It has ambidextrous fire controls provide comfortable use for both righty and lefty shooters M-LOK slots around the handguard run the entire length for easy attachment of accessories and tactical devices. The advanced-style metal receiver features additional ambidextrous controls to make the shooting experience even smoother, whether shooting left- or right-handed. Also, the retractable M4 stock allows for a custom ergonomic fit while still providing buffer tube space for batteries.