Came across this image, which by the cars in the background is late 20s? I can't ID the shooters and can't enhance the pic more.
The gentleman on left has a likely 32" Parker C grade by the checkering pattern

[Linked Image from photos.smugmug.com]

On right, an odd forend and something sticking out from the frame. Hard to tell with the shadow but looks to be a boxlock
Could it be a Cashmore Nitro Bolt (Improved Mills System)?
This may be Daryl's

[Linked Image from photos.smugmug.com]