If “Perfection” is defined as a Glock, I think we have to redefine what “perfection” really means. Don’t get me wrong, the Glock is an excellent handgun (I carry them daily), but they are not bullet proof or completely resistant to the repeated battery of long duty cycles. Various parts in the handgun wear and break.
If yours hasn’t, you haven’t shot enough (or perhaps you do have the one unit of true “perfection.”)
Over at Active Response Training, Greg Ellifritz, a trainer and certified Glock armorer documents what he has typically seen go awnry in the handgun over his hundreds of thousands of rounds of experience, both shooting, teaching classes, and as the local department armorer.
The most common items to break are not surprising, given the overall generally reliable nature of the handguns. According to Greg, the most common part to break is the Trigger Spring, which connects the trigger bar to the rear housing. An easy “fix” is to move to the “NY” trigger springs, which are a standard compressed coil spring versus the stock design, but that does come at the cost of pull weight.
The second most common part to break is the locking block pin, which sits above the trigger pin helping keep the locking block in place. During prolonged usage, that pin gets battered as the barrel slams down and to the rear. Fortunately, its a easy fix, just drop in a new pin.