The guys at AMNB have been checking out the S&T ST320 A1grenade launcher:
We have a new review up which covers the S&T ST320 A1 Grenade Launcher. A solid and nice piece of airsoft pewpew.
AMNB
Link: https://www.airsoft-milsim-news.com/st-st320-a1-grenade-launcher-amnb-review/