510 Connector with spring loaded firing pin - 22mm base
These are the upgraded 510 connectors
Stronger Spring added with hole on the side of the center pin
Easier to solder positive wire to the center pin
Comes with grounding ring
These are the upgraded 510 connectors
Stronger Spring added with hole on the side of the center pin
Easier to solder positive wire to the center pin
Comes with grounding ring
Perfectly fine, consistent threads, only a little dirty, but mech hardware usually is so no big deal.