Glock

Glock built its reputation on being boring in the way that matters: the same trigger every pull, very few parts, and a tolerance for neglect that borders on rude. It is the default duty pistol in much of American law enforcement for exactly that reason.

The numbering takes a minute. The 17 is full-size, the 19 is the compact that most people end up carrying, the 43X and 48 are the slim single-stacks built for concealment, and the 4x series are .40 and .45. Aftermarket support is effectively unlimited, so a Glock is rarely the last version of itself you own.