are talkin about removing the ASA or detaching the ASA from the bottom of the grip frame still attched to the hose? cuz to remove the ASA from the hose then you would just unscrew the fitting on the hose attched to the ASA.
The screw is in front of the asa just above the steel hose in that hole, you need an allen wrench, and then once its loosened it should just slide off.
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Black Diablo Wrath
Smoke Halo B
Crossfire 68/3000