I run about 100 rounds through any gun, new or used, using multiple mags. If I get flawless function, it gets cleaned and get another 50 rounds through it next range session. If those are also flawless, it gets put into the carry/ HD rotation.
Primary CCW, Kel Tec P-11. Secondary CCW, Taurus 709 Slim
Primary HD, S&W 469, no secondary. I will be picking up my Ruger P-89 this weekend, so it will go into the testing phase, and then pull primary duty as HD, bumping the S&W to secondary HD. I doubt the Ruger P-89 will see any concealed carry.
Any malfunctions that are not magazine related render the gun as range use only, and trade fodder.