Most handgun failures are due to timing. Timing failures while not catastrophic can cause functioning problems if not properly repaired. Any handgun if used enough will require a timing or tune up to replace the pawl and possibly the ratchet and sear will need attention.
The inner workings of the magnum hand gun under excessive pressures will weaken the main spring and leverage. This in turn puts wear on the contact parts. After time there will be throat erosion from poor bullet choices and gas cutting.
The mass or size of a magnum does not assure that the gun will last for ever. The Rugers of which I have many and still own needs mass because it is an investment casting. These cast handguns allow many shooters to own a magnum due to the lower cost. S&W and Colt continue to use receivers milled from Bar Stock milled not cast from powdered metal. Milled from steel recievers do not need the extra weight and bulk to hold pressures.
The Freedom Arms offerings are precision cut and milled not cast. They are the Swiss watch of American handguns. I shot the first handgun to come from the Salt Lake City plant. That was before it moved to Freedom, Wy.
In the end in any hand gun regardless can and will jump the timming.