It's definitely not for SMG . It's just too small. I say maybe for pistol .
SHS Airsoft Stable M-Series CNC Hop Unit With Rubber T-T0094 6mm bb's UK Seller
02 Jun, 2021
Poor quality plastic and fittings
O Ring don't find on inner barrel. Plastic details poor quality one broken on installation . Fittings poor quality , after removing don't fit
need to replace .