Issue resolved

no idea on the pins but you say the gun doubles?
what would that mainspring housing pin have to do with the gun doubling? I'm lost there hehehe
Have you disassembled and checked the internal parts.... ie, sear spring, sear, disconnector , disconnector hole is clear of debris or burr? check sear/hammer hook engagements.
Does the gun have hammer follow?..... it must if it's doubling

give the gun a full strip down, clean the frame and parts, relube and test it on the bench for hammer follow a whole pile of times before any more live ammo goes in the gun.
Could be something simple like debris or something
but if it is a mechanical failure..... I'd be talking to the seller.
 
As mentioned previously

Strip it
Clean it
Inspect it for bubba workmanship
Replace any suspect bubba parts
re-assemble
Shoot it
or
Send it down the road.
 
Do you have a trigger scale? Sear , hammer "work"?
I don't know what awesome trigger is ? too light do you think?
I had a old 1911 that had a trigger done by someone, it did not double, but it did go F.A.
Also check the leaf spring .
 
If the gun is double-firing and someone sold it to you knowing that it does, that could be a crime. Get a refund or call the CFO. Don't mess around with this at all.
 
If the gun is double-firing and someone sold it to you knowing that it does, that could be a crime. Get a refund or call the CFO. Don't mess around with this at all.
I can relate with the OP but all the OP can do is contact the seller and try to come to some resolution. The CFO does not give a damn one way or the other because its not his/her/other problem.
 
Well, if we're talking about the pistol on the right, it sure looks like someone didn't use the correct for the job.

- Have you taken it apart to inspect the sear/hammer/sear spring?

The pistol will double because the sear doesn't engage, could be the result of
- Not properly installed/weak/damage sear spring
- A defectives sear or hammer
- A failed "polishing" job, trying to lighten the trigger pull
 
A way to test for a dangerous situation is to lock the slide back(check that gun is unloaded,no mag in gun),then holding the gun loosely,drop the slide release.The hammer should stay back.If it goes to half ####,or worse,follows the slide all the way down,it is in a dangerous condition.(note that this test is very hard on the sear/hammer interface so you dont want to do this repeatedly).Likely someone has tried to do a home trigger job either messing with the sear/hammer or more likely bending the sear spring to get a lighter pull,but now with not enough pressure on the sear(left wing of the sear spring as viewed from the back).Another possibility is that the trigger stop screw is screwed too far in.Hard to believe the gun left the factory this way.Either way,if your not comfortable working on 1911s,have a gunsmith look at it.Your gun is likely close to going full auto which can be pretty dangerous.
 
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