Flying10uk--
One of the good indications of the P14 stock is the dial volley sight base on the left hand side of the gun. I am aware of subcontract replacement P14 stocks being made in the UKwithout the dial volley sight base. Unfortunately I am not aware of the particulars to tell them apart. I guess one way is looking at the length of the magazine box well in the stock. The P14 is shorter.
Cheers
--fjruple