Is it an Accutrigger? Maybe its set too light.
Did you install a new scope base, 2nd screw back on the front base could be too long.
Did you have it out of the stock or do any other work?
The bolt assembly screw is 1/4" allen. Set the bolt on the benchtop with the handle on the right pointing towards you, bolt head on the left . Insert the 1/4" allen wrench and firmly push down on it to loosen the bolt assembly screw. Think chest compression, if your hands are not used to hard work, you may use a folded up shop towel on the allen wrench to cushin. By the time its screwed all the way out, only a little spring pressure if any is on it so don't worry.
The rest is common sense, take pics if you have to or google it.