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No4 MkI and MkI* Rifle

Bolt removal from the No4 MkI - Images

Indicated by the red circle, you can see the bolthead and spring plunger. To remove the bolt the sight would have to be raised, then the plunger would have to be pushed down and finally, the bolt would be slid back to allow the bolthead to be rotated up and out of the rifle.

Close-up of the plunger.

Bolt removal from the No4 MkI*

In comparison, indicated by the red arrow, is the cutout at the forward edge (near breech) of the raceway. This cutout is just large enough to accommodate the bolt head. By manipulating the bolt, the bolthead is positioned correctly and it will rotate up, allowing the bolt to be pulled back and out of the receiver.

Close-up of the cut-out and bolthead.