Notice also that in 1911 and in 1960 an off the rack Colt Govt. model would fire 6000 rounds without jamming or a part breaking in Government tests.
GOVERNMENT TESTS!!!!!!!!!!!!!!!!lets not even go there!!!!
My kimber custom classic target has about 8000+ rounds through it, its still as tight and as accurate as the day I bought it. It still looks new, No parts have broken, The extractor which is machined barstock (not mim as some asssert here) has never lost its tension.
But then I must just be lucky.
The problem with the internet as a statistical research tool, is that if 20,000
Custom classic targets are made and sold, you only hear about the three that had a problem, and you hear about them over and over and over, and over and over and over and over and over and over and over. The other 19,997 you never hear a word about. In 1915 or 1960 there was no error net, and no one kept track of how many parts broke, or how long they lasted, companies didnt do recalls on thousands of guns, to replace parts when a couple of pistols had a problem. You paid your money and you took your chances. If you had gone to the Colt factory in 1960 you would have seen machinists making parts and checking to see if they were within specs using a micrometer. If you had pulled 50 guns and measured and inspected all of the parts, tollerences would have varied a good bit from gun to gun and from part to part. That meant every gun had to be hand fit, when you hand fit every part it costs more to make, but you also have a greater potential for a failure due to errors made by the humans fitting the guns and making the parts. They used to have a big reject bin for out of spec parts, and it was FULL!!!!
Now a-days you would find CNC controlled machines, MIM parts, and less hand fitting. My guess is that if you pulled 50 guns and tested every part the tollerences would be nearly identical, and every gun would be much closer to the blueprint design, than in 1960.
I do know this though: a specific requirement for the 1911 was that the parts be interchangeable, and replaceable on the battlefield with no tools. In 1915 Army units issued a 1911 also had an armorer with spare parts. So obviously JMB and the folks in army ordinance must have thought that parts would break on 1911s. The fact that 40 years later in 1945 they still had armorers with parts, proves that parts did break, and did need to be replaced.
JMHO YMMV.