Number/numbers of rounds?
I have bought guns that had in excess of 10,000 rounds thru it. Paid a fair price.
If your gun, and I am talking of the one pictured, is clean and functions with all ammo, who cares.
What I am saying is that a weapon with few rounds can be sold because it does not function--so therefore; few rounds thru it.
A person who plays the games will often want to sell a particular weapon because they want a new toy or caliber, and it may have 10,000 rounds down range. I would and did buy such a gun---I had no problems and liked the gun.
Now, I have no anal thoughts about a used weapon. i have anal thoughts about the pieces in the weapon.
Too this end, since I am not mechanically turned, I generally, well more than generally, will take it to aSmith and get his opinion about the parts and let him do his magic.
If this part looks worn, it is because there are two surfaces which rub. Smooth it out with some emory cloth or take it too a Smith---my choice.
Blessings