Probably a Springfield 311 or one of the variants made by Stevens. Riverside 315 was another common one.

The striker fired action SxS from Stevens were older,,they were the Lewis patent actions (1915) and were made up into the early 1930's I believe.

Anyway. to get at the strikers themselves, first you have to remove pretty much everything behind them in the action/frame.
Triggers, safety, sears, top lever rod and spring, top lever, ect.
Clean out the frame,,strip it of parts and be left with just the two strikers w/springs held in the frame by their cross frame support inside,,wall to wall.
The support is held in place by the pin thru the frame at the lower corner of the frame on sides.

A sturdy steel dowel pin center support inside further supports the cross frame piece (which is just a steel stamping). That dowel support pin is pinned to the lower tang of the one piece frame.
Lots of pins,,but it makes for easy disassembly.

There is some main spring tension on the cross plate even when the strikers are down/uncocked. But when disassembling the mess by knocking out the pins, there is not all that much spring tension that things go flying.
It's usually easier to drive a long slender punch through and push the long frame support pin out first,,leaving the punch in place.
Then remove the dowel pin support.
Then go back and 'pull the pin' punch on the frame support and let the assembly back off and out of the frame.

Getting the springs back in again can be tricky. But using either a small c-clamp in the center of the support and against the front of the breech face to draw the springs and plate down to get the punch back in place works.
We used to pre-load both strikers and lock them in position with a small grip-lock pliers on each striker end,,plate in betw. Then set the assembly in the gun and westle the thing gently into position to get the punch through to line things up. Then tap the pin itself back through.
The cross plate will tilt back some when the pliers or clamp is taken off. But the plate is secure and you just have to push the plate back into upright position to replace the support dowel and re-pin.

Simple..


Here's a video about taking one apart.
It's pretty helpfull in getting the frame parts out. BUT the guy doesn't bother to touch the strikers at all.
https://www.youtube.com/watch?v=TuvIUr1uctw

There is however some very nice closeup pics of the stripped frame w/strikers and support plate & dowel iin position.
At 9.15 into the 51min video there is a good shot of what you will be dealing with.
It ain't hard to do,,they did it 100 yrs ago..