Parker lifter mechanism

[8GAUGE]

Can you see the tab with the barrels off? If I need these parts where can I get them?

[Pa SxS]

Take the barrels off and look at the bottom of the well. If the top lever is at the 6 o'clock position, move the top lever over to retract the bolt. Look for the trip.
Parts are available.

[8GAUGE]

There is no top lever. It is a lifter in front of the trigger guard.

[Pa SxS]

Then push the lifter up to retract the bolt