Yup, mine is a v2 with the fixed ring. It's a spring loaded pin, I can push it easily with a small screwdriver. If the ring was big enough to fit a kayfun/russian it would probably be my main device. Maybe I'll cut the ring off one day.
Looks to be just a full clear m tank section. FastTech sells them too. I got one but didn't use it and threw it in for my friend. They'll work on any clone.
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