I"ll be interesting buying it fro you.
Impossible to answer without a detailed description of all features and markings.
I have two 1878 Jas Parker & Sons double barrel shotguns.
We'd have to start by figuring out what make and model it is. What markings are on the gun? sales@countrygunsmith.net
Pull the trigger
Depends on the shotgun.
It is a lever inside the trigger guard, forward of the trigger.
The 870 Remington shotgun used to be a popular candidate for a "release" trigger.
The only way is to replace the whole trigger but it will still have a hair trigger
Made by Savage/Stevens. We have trigger guards.
go to launch shotgun and grab the shotgun and pull it back and pull it forward then press the trigger
Those markings suggest manufacture between 1900-1920. sales@countrygunsmith.net
The hammer will be in the cocked position. Nothing will happen until you pull the trigger.