Bore scope or bore light, after the weapon is unloaded an bolt remove/locked open.
this answer is correct but there is an easier way, take the bolt out and look at the end, make sure there is no burnt, gouged or blistered metal on the end of the bolt (the end where the firing pin is ) if there is , this indicates an over pressure of the barrel, do not buy it! also look at the muzzle to make sure the hole is round with no chips or flat spots, (if present this can be fixed), look down the barrel , if the rifling is barley visible they are worn , and the easiest way to check the rifling is to take a bullet of the same caliber as the gun put the bullet into the end of the muzzle if the whole bullet lead slips into the muzzle end the rifling's are worn out, if the bullet does not go all the way in they are good, baring none of the other things listed are present. i would buy the weapon
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