A lot of people recommend not carrying a pistol until you've put 500 rounds of whatever and 100 rounds of your good defense carry ammo through it. I've always put at least 100 rounds through all of mine before I felt comfortable. Most good handguns will just be considered broken in good with 1-2k through them. Check to see if the previous owner(s) has kept it clean and see if there is anything obviously wrong with it (heavily scuffed, dirty inside, hard to go into battery for a semi auto.)