Booligan Echo1 MK1 SR556 6.75" Overview
OptimusPrime
11 Oct 2013
The just recently announced Echo1 Mk1 SR556 Quick Detach Barrel Extension gets a quick overview video by Booligan Airsoft... "Just a quick video I put together to show the brand new Echo 1 MK1 SR556 barrel extension. Pretty cool system that looks absolutely great, but it slightly hindered in its compatibility because of the recessed threading inside the flashhider."