(HELP..Question) Pressure trigger for BLF lucky sun D80

Hi guys,

I have recently bought the BLF luckysun D80. (a few actually…Thanks Kronos and team!)
I purchased one for a friend who wants to use it as a gun / rifle mounted light.
Is there a standard pressure switch which he could use?

Any help is appreciated, thanks in advance!

Greetz,

Haxquiz