As the rifle is fired the bolt is closed up against the barrel and held there with spring pressure.

You will notice that the tab on the bottom of the lever is pushed down into the receiver.

This is what just the bolt looks like in that condition.

As the round is fired and pressure is placed upon the bolt it tries to move backward. This causes the bolt to try and move backwards. The lever keeps the front of the bolt closed and starts moving the rear of the bolt against spring pressure.

Another picture of the bolt by itself showing what is happening.

Once the bolt is totally open the lever is no longer having any effect and the bolt can now open allowing the cartridge to eject.

This is a picture of the bolt during this phase of operation.

The last picture if with the lever removed form the bolt.

Thanks for coming by and your comments and opinions are appreciated.

Here are a couple of additional views.