Brit,I started this thread in 2016
https://thefiringline.com/forums/showthread.php?t=577822&highlight=carry+gun+modifications
Among the questions I posed, What if I bought an ATI 1911 made in the Philippines and I just did not like the Harbor Freight look of the slide stop?
What if I decided to put in an Ed Brown slide stop,a Wilson Beavertail,Cylinder and Slide Duty and Carry , hammer/sear/disconnect/sear spring (with NO Dremel work!!) A new Colt thumb safety a flat mainspring housing,and Trijicon sights?
And I dd just a little more tuning so it will feed empty brass from the magazine and the ejection is civilized and consistent .
All systems tested and work as they should, 4 1/2 lb trigger.
Yes,I modifid it. I did the work,too.
I'm pretty confident if the police dept armorer evaluated it,he'd say "No problems"
I'm glad S+W M+P series triggers have seen improvement.of late. My 2016 vintage M+P 9 C trigger was off the scale of my trigger gauge. The trigger would lift a full,sealed 8 lb can of powder without releasing. It would not quite lift my M-1 Garand.
I put in an Apex Duty and Carry kit.
We are responsible for every bullet we launch. At some point,trigger pull can cause more misses. Misses are dangerous.
Which is "safer?" A 5 lb pull or a 9 lb pull?
The # 10 post ....I think it was by Spats,explained for the Homicide vs SD trial, Factors such as " Yes,I shot him in fear for my life,no accident" pose a different question than the civil case later.
The lawyer may try to (for example) go after your homeowner insurance by proving you may have accidentally shot the plaintiff due to gun modification.
"If only you had the factory 9 lb trigger,my client would not be a paraplegic today."
Its a pretty serious,thorough thread worth browsing.
The conclusion? There is no answer. You are on your own. There are things to avoid. Life has risk.
My initial post # 1,and post # 10 are worth a read,IMO.