METAL STEM & Screw thro bowl
First image is my version, the others are Doug Bisbee's
KOOL SMOK .Two versions, mine seems to be, from the leaflet, the first model. This version allows the bowl to be unscrewed and screwed back into the front cap of the pipe for easy of carrying.
The second version from Doug Bisbee (www.dkmetalpipes.com) has a different end cap apparently to increase cooling but the cap is no longer threaded to take the bowl.
They probably realised that unless the bowl retaining screw was firmly anchored in the briar, it may well have meant carrying a screw driver to facilitate converting the pipe from travelling to smoking and vice versa.
Overall length in smoking mode 136 m/m