More important than what specifically it is, what condition is the action, chamber, rifling, and muzzle in?
What condition is the action in? Is it relatively tight and crisp when cycled or sloppy and floppy? Does it feed and cycle ammo correctly?
What is the trigger like? Crisp and smooth or gritty?
What condition is the hammer action in? Does it cock back smoothly and surely? Does the ½ cock work? Will it hold the hammer back when you engage it and then pull the trigger?
Is the chamber and bore bright and smooth or dark and pitted? Is the crown at the muzzle clean and even or worn from a steel cleaning rod? Take a M2 ball (150grn 30-06 round) and stick the bullet down the muzzle. You should see about ¼" of the bullet showing before the case mouth.