Echo 1 M4 15" Convertible Outer Barrel airgun rifle Adjustable nozzle dwell and return

Adjustable nozzle dwell and return to battery times to optimize feeding from any magazine

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

with adjustable velcro strap

Features a unique heavy weigh mesh construction with a thick padded lower section for improved comfort and protection

more shots per battery charge and less heat

Echo 1 M4 15" Convertible Outer Barrel airgun rifle Adjustable nozzle dwell and returnDescription: 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.