This is a ring pull for the ZWQ Viper S200s that mounts to the top of the slide using four M3 bolts. There is a version for countersink bolts and normal cap head bolts. The ring pull sits low enough to not obscure the sights, but is still thick enough to be very sturdy.
I made this because after I upgraded the spring to get 130fps, it became very hard to prime. This ring pull doesn't get in the way of any holsters or snag on gear.
The author marked this model as their own original creation.