weakness
Its just not lots of shooting that will disable or spoil a handguns usefullness. The weak link in all the top quality DA revolvers, and any auto so equipped as well, is the dang gum adjustable rear sights. I personally, thru no intentional act, have goobered the rear sights on a Smith L-frame, and a Smith K, both in duty rigs, resultant of a hard fall at just the right angle and landing on the holster. Didn't do me any good either.
Saw an accessory the other day, a HD looking "fixed" rear sight, that screws into the recess of the rear target sight for S & W revolvers. That would be an attractive accessory to me, were I too be carrying a Smith for serious business.
The old channel type fixed sight as on the Model 10 's M&P's and the big 1917 and New Service types, and the original Peacemakers would have held up much better I'm sure. So too I suspect fixed (well driftable) steel/metal sights on an auto like the 1911 and others. The factory sights on all Glock, adjustable or not, are pretty crappy. MY G34 today had a plastic dingy hanging off the front blade, which I had to clip off.....looked like a hangnail.
Another chink in many pistols are the grips. Loose a grip panel, and on some models, very vital mechanisms are no longer contained or retained in their proper locations. For all my enthusiasm for the brand, the SIGS are a classic example of this fault. Yeah, proper maintenance should catch a loose grip screw....but stuff happens. In really rough use, stuff gets wacked pretty hard, abused regularly. And it may be some time between maintenance intervals. Check out combat photos of any era, .....guns missing parts/cracked parts, are pretty common.