I knew that there are adjustable gas blocks to help with overgassed/undergassed issues, and I remember hearing about gas tubes with different gas port sizes like these...
https://blackrivertactical.ecwid.com/BRT-EZTUNE-Gas-Tube-Configurable-Carbine-p103167251
...but I never knew there was an adjustable BCG.
https://bootleginc.com/product/full-auto-adjustable-carrier/
https://blackrivertactical.ecwid.com/BRT-EZTUNE-Gas-Tube-Configurable-Carbine-p103167251
...but I never knew there was an adjustable BCG.
https://bootleginc.com/product/full-auto-adjustable-carrier/