gw,I can give a reasonable guess.I'd say the(I Think) ATC was about 2013.I would place the SA Mil-Spec 2011 or 2012.
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On sending 1911's back....
I understand you have the expectation that if you buy a $500 gun you expect it to work.That seems reasonable.
The space shuttle Challenger blew up.The Hubbel did not work right before repair.Have you bought many automobiles that were correct out of the door?
I would guess,for the price,a bill of materials(the parts) are pulled from the stock room and the gun is assembled per the prescribed process,and put in the box and shipped.I doubt a testfire is done.That is the modern quality process.ISO 9000,and all that.Deming,Juran,Crosby.They don't want a file on the line.That would take skill.And a refinish.That is "tampering" and it is not "statistical process control"
Yet if you look at how the "Quality" 1911's are built,its not 6 Sigma.Its stone knives and bearskins.There has always been the 1911 "Armorer" Wilson,Brown,etc,DO check,tweak,file,fit,tune.Maybe $750 worth of tinkering?
Just my opinion,but if the pin holes are off location,or oversize,if the dustcover is off center,etc....Then the gun is justifiably a reject.
A 1911 came from a time that required more than an assembly of parts.The Armorer must establish relationships.
Frame,slide,lugs,barrel feet,linkdown,timing....All a dance,that must be choreographed.Every ectractor gets filed for nuances of radius and blend.It gets bent for tension.
That one funny sear spring balances the trigger return,sear reset,disconnect function,and grip safety return.Its done by eyeball,bend,and try.At Ed Brown,and at Wilson,etc.
The 1911 is pretty robust and forgiving.Most parts box guns can run.
But you better figure a $500 1911 is a kit of parts that have been assembled.
Its sad we don't have more folks that know as much about using a pillar or jeweler file as they do a credit card.
Tuning an extractor is not rocket science.And odds are that is why your gun went back three times.Or maybe it needed some link,pin,foot tuning,or your ammois a variant,etc.
Could be a 1911 is not for everyone.
I guess there is a reason they make Glocks.
Most motorcyclists,4 wheelers,farmers,ranchers,bushpilots and kids with bicycles etc do not call for a tow truck and a mechanic every time a machine fails to proceed.
They learn their machine.
And,yes it is true!! Some folks can cross thread a crowbar in a sandbox.Removing 4% of the frame with a Dremel,or rounding every edge making it shiny is often not the answer.But 3 small strokes of a file and 2 ponds more extractor tension is often why "THAT doggone 1911 won't run"