raccoon29

You probably would have seen Screw grip and PHV1 actions
- they are (were) made by Webley - Screw Grip has a Spade
shaped Dolls head that intersects with the Toplever Spindle
and the PHV1 has a Club (as in Ace of Clubs) shaped Dolls
head that DOES NOT intersect with the Toplever Spindle.

They are often referred to as Treble Grip and both are Webley's
although if they have another name on them (ie Rigby etc) then
Webley dosn't normally get mentioned.

Re "has an extesion that goes into a greener crossbolt "
NO, if it has a Greener Crossbolt they are not Screw grip and PHV1 actions
even though they may look like them.

Re "dolls head and cams the barrels down, right? "
Spot on - good description and this is why the Screw grip and PHV1 actions
generally do not come loose.

Re "And for these actions when you close the barrels you have to turn the
top lever not as where in most doubles where when you close the barrels
the lever goes to the locked position?"

Not sure what you mean here - can you explain further. IMHO, they work
just like other Toplever Hammerless actions unless I misunderstand you.

I'll see if I can get NitroX to post a photo as I wrote an article on these
2 actions and have a close up photo of 2 of my 500 NItro doubles which
clearly show the 2 shapes

Hope this helps. Ask away if you have any questions.

500 Nitro