No 4 Mk1 Trials Rifle Rear Sight Plunger & Spring

[Surpmil]

Here's a scan of a print from the film camera days that shows the difference. The rifle on the left is the trials Model C, of which 56(?) were made if I remember correctly. Notice that the cut made to accommodate the larger and later standard plunger is "in the white". The slightly odd residual "lip" at the top of the bolt way on the right side is thus explained!

And here is a crop of a Model C trials No.4 being shot at a range in the UK. The dowels inserted near the forend crossplate were a civilian modification. Notice the sling swivel on the guard. The forend cross plate is also differently arranged than the standard No.4.