Responses
I've always believed it means the sex or relationships are explosive like a guns blast.
This might be me being perverse but I thought the 'pistol' was referring to the male appendage as it do shoot out semen... ╮(￣▽￣)╭
It's a band, so maybe the mangaka saw their name and liked it and used it as the title. even though its nonsensical.
So this is random but what "pistol" means anyway coz in my language it means gun and I dont think that what the author what to imply as a sex gun ...or is she??(￣∇￣")