Jim makes an EXCELLENT point. Lots of practice,, combined with a quality firearm, and working on techniques that improve your skills, will be MUCH better than having the slickest gun there is.
I recall the day a good friend (and LEO) whom I was the RO for at a USPSA match. He was being told he needed "xyz" type of gun & equipment. Well, he blistered the stage. Later,, when the match was over,, I suggested he demonstrate SKILL. I was on the timer, and I personally saw him do the following;
Facing the target, hands at surrender, target at 10 yds. He took a simple plain Kydex holster, and a totally stock Glock 9mm as his equipment.
At the signal, he drew & fired (2) rounds at the target. His (2) shots were touching each other, and the time was .62 of ONE SECOND.
He politely explained that he spent a lot of time practicing with normal equipment, because it was what he carried daily. Lots of dry fire practice, combined with live fire practice.
That said,, a good clean action job, where it removes burrs, allowing proper contact points with all the moving parts, can make careful long range accuracy better,, IF THE SHOOTER DOES HIS PART.
A good trigger in a smooth action,, (notice I didn't say light) can make serious long range accuracy handgunning easier to achieve.