Echo 1 M4 15" Convertible Outer Barrel airgun rifle more shots per battery charge

more shots per battery charge and less heat

Requires less battery power to initiate motor

This updated classic takes the M4A1 model to a new level of performance with a one-piece full metal alloy upper receiver

CNC aluminum handguard with four sides picatinny rail

Echo 1 M4 15" Convertible Outer Barrel airgun rifle more shots per battery chargeDescription: Echo 1 M4 15" Convertible Outer Barrel The Echo1 M4 convertible outer barrel set allows you to change the look of your M4 in matters of seconds. This enables the user to have one gun that can be used for both indoor and outdoor scenarios by simply changing the barrel length.