A Killflash designed to fit the Streamlight Protac Mount 1 and 2 weapon flash light.
 
I was inspired to make this after watching Garand Thumbs RECCE videos and it was brought to my attention the glare of weapon mounted lights. This was my solution and hopefully yours too.
 
This is a 3D printed product made with PLA, and extruded with .08 mm layer heights ensuring a higher durability and longevity. It's made on a K1 Max 3D printer and was made over 500 times before I finally got to a point that I was confident in it's quality. Right now I have it available in a Matte Black filament. 
 
I have tested this on a 16 inch AR-15 firing a total of 180 rounds. This was mounted to a Protac Flashlight attached to the rifle using a quad rail system. After firing there was no heat transfer to the Killflash, no warping, and no melting. These Killflashes are made with a tight fight to stay attached and may require a mallet to attach and/or plyers to remove.