Krytac Black Metal Flash Hider 14mm Negative and Set Screw flashlight with strobe The Hopup Chamber EVO unit

The Hopup Chamber EVO unit is built with a Precision Aluminum Rotary Dial Knob for fine hopup adjustments and equipped with 4mm Flat Soft Bucking Nub (6mm Bucking Nub is optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot

Fits on native 21mm threaded rifles (M40A3

The Valken ASL+ Foxtrot45 M4 AEG Black Airsoft Electric Gun

but may also work in other standard AK type airsoft guns as well

enhanced hop up chamber w/concave arm

Krytac Black Metal Flash Hider 14mm Negative and Set Screw flashlight with strobe The Hopup Chamber EVO unitMatte black finish Metal alloy construction Factory direct OEM replacement part with set screw