Type of Bipod Spigot?

[Barn Side]

Anyone have an idea about the type of bipod spigot below:

 

[beetroot]

Looks about the right size for a parker hale bipod.

 

[919th]

Parker-Hale is my guess too.

 

[Barn Side]

Thanks for the replies. There seem to be four little holes inside the larger spigot hole.

 

[CheapBasterd]

looks like a QD Mount...