I was in the military in the 70s, 80s, and 90s. I have more military experience with 1911A1s than M9s.
Every 1911A1 I was issued was WWII stock. I never encountered a "NIB" 1911A1, apparently because there were so many ancient 1911A1s remaining.
I suspect the "NIB" 1911s you mention were...
That's not impossible, but color me skeptical.
All the 1911s I dealt with were practically worn out and manfactured by various vendors. I vaguely recall coming across a Colt here and there.
Those 1911s were probably antiques from WWII, with A LOT of use and abuse, probably with mixed parts by the time you encountered them.
I had an S&W 4506 that would chamber empty .45 cases from the magazine. It was a nice pistol. It ended up being destroyed by the San Diego Sheriff's Department.
The BCG isn't the "upper". It's a separate assembly housed in the upper.
Be that as it may, carriers, bolts, extractors, and cam pins do crack and break, and gas keys leak and loosen.
Actually, that's the opposite of competitive AR shooter experience, according to Ben Stoeger. The upper has little mechanical stress whereas the lower absorbs the mechanical impacts.
Barrels wear out & gas ports erode.
MilSpec is THE spec. No deviation from the specification is permitted. It's what the military contracted to buy. It has to be manufactured, processed, assembled, and inspected according to the spec.
Colt and FN have had the M16/M4 contract for decades. Neither are "lowest bid" that...
Multiple firearms instructors.
Top action shooters buy cheap PSA uppers to mate with a BCM lower to practice with. They shoot so much they wear out the PSA upper. But they don't use PSA lowers because they don't last. The cheap PSA upper is considered a consumable part.
Reputable firearms instructors have observed and reported multiple failures during use in their courses.
Your "experience" appears to be narrow and shallow.
Simply being in the Army doesn't make you an expert in ARs, guns, or ammunition. It just means you enlisted and served.
Your military experience is with authentic MilSpec military firearms.
Many others have different experiences.
Ignorance is bliss.
Removing blown primer debris, that jams the fire control group, from a cassette trigger requires a tool to unscrew the pins, whereas the pins on non-cassette triggers can be easily pushed out with the tip of a cartridge and the debris removed.
AR manufacturer CNC machines can indeed be setup to milspec dimensions and tolerances but if there's no Quality Assurance inspections to ensure the machines actually machined to milspec dimensions or no operator error occurs in setting up the machines then defective parts reach the consumer...
PSA delivers a mediocre consumer grade gun.
There are assembly flaws.
There are manufacturing flaws.
Consumer grade "milspec" means it's allegedly milspec in dimension only, and may not consist of MilSpec materials, manufacturing processes, assembly processes, and inspection processes.
In my OC training, I was instructed to use short bursts to produce a faster effect.
In one of Chuck Haggard's online MUC course videos, he trains his students to use a short sweeping burst to the eyes. Go to about the 8:30 point in the video below:
https://www.youtube.com/watch?v=QMdL3XKFGSw
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