I think this is the crux of Bill's point.
If a handgun were actually engineered for optimum endurance and manufactured to a properly fitted spec with ideal materials & surface treatments they could last for far beyond what we think is normal and shoot more accurately than we accept. We'd probably end up with guns that could survive hundreds of thousands of rounds with just some spring replacement (not as often as current springs need replaced) and have sub 2" 25 yards pistols out of the box.
Since most consumers think 200 rounds per year is a lot and hitting a milk jug at 15 yards with a few rounds out of a magazine is great manufacturers cater to the easier demographic and leave the high end .0001% of shooters to deal with it.
This is just like the bicycle industry. Most folks consider a 10 mile ride long and couldn't conceive of riding 1000 miles per year much less 10,000. If companies designed bicycles around the elite few they'd cost a bit more and last nearly forever but almost no one would notice. Meanwhile the manufacturers would lose sales to the company that designs bikes around the average user and sells them for $150 less while keeping profits high. It frustrates me to no end but I understand the logic.
The Minority Marksman.
"When you meet a swordsman, draw your sword: Do not recite poetry to one who is not a poet."
-a Ch'an Buddhist axiom.
Rails are molded into the frame when it is poured into the mold. Therefore, the premise that Kyle's were "replaced" is suspect. Glock may have replaced a frame, but didn't replace the rails. I've been a certified Glock armorer since 1989 and have the advanced certification and more actual time on the gun as armorer, instructor and carrier than this old guy wants to admit.
Regional Government Sales Manager for Aimpoint, Inc. USA
Co-owner Hardwired Tactical Shooting (HiTS)
At what juncture is "a gun" not the same gun it was from the factory? Or are they like my dad's old axe that's had 3 new handles and two heads, but it's still the same axe.
I mean, replacing the frame is a pretty obvious one, but what about barrels and slides?
Bingo! Because the average driver drives lots more miles than they did 40+ years ago and demands a vehicle that won't leave them stranded.
ETA
Some folks definition of "not long ago" is skewed by their age. My 72 year old dad is an example.
(not saying Gardone is an old man)