I got this far in the thread, and figured I'd take a stab at quantifying the Accuracy International to a US Army B4.
You started with the M24. It had its issues. Plenty of things you hated about it. Plenty of things you wish it did but you found all the ways to make it work, and work well, with M118LR. You even cursed the hybrid MOA/MIL Leupold scope. You then got the XM2010 and M2010, got to experience a superior caliber in .300WM and the change to a chassis system, while still maintaining the familiar feel of the Remington action.
The Accuracy International takes all the things you loved and hated about your service sniper rifles, and makes them better. Its a rifle you simply do not have to fight in any way, shape or form. It is a rifle with adjustability and trigger/shoe setup that allows the rifle fits like a glove, including trigger weight in both stages. Its the rifle with a tight and positive locking bolt and the smoothest action you've ever felt, along with a 60 degree throw that makes cycling taughter that you thought possible. And you get to do this from a FACTORY rifle, making all adjustments within minutes, yourself. This includes barrels, knowing every single component you get, including spare parts, will fit like a glove and will not require an armorer.
Its a rifle that is guaranteed to do 20mm groups at 100 meters, and 30mm groups after 10,000 rounds. Its a rifle that shoots better on your worst shooting days, than any of your service rifles on your best days. Its the rifle that when you absolutely, positively want to say, "It's my shooting or the ammo, and not a problem with the rifle," you can be sure of it.
Its the rifle you can count on in any weather condition, any environment, and know it will work, period. From the coldest days to the hottest. And its a rifle that can go through 30+ years of fieldcraft and use without needing a single component replaced due to catastrophic failure i.e. bolt, firing pin, etc. Its the one rifle that if shit hit the fan, you'd want to be grabbing and knowing that it will get you through anything. In the precision shooting world, it is the peak of the "buy once cry once" dichotomy.
As an example: the two rifles shown below from ISC 2024 -- Irish Military Issue AI96 Sniper Rifles, designated the Arctic Warfare (AW) by AI chambered in 7.62 -- are from 1993, and are all original: the bolt, the firing pin, the barrel, all of it. Only things changed are the skins which were upgraded to a newer thumbhole stock system, and the glass using modern SPUHR and S&B. That a sniper rifle that sees fieldcraft can be ran and used accurately for this long, is a testament to their cability, ruggedness and robustness.
View attachment 8466612
You get the rifle because you want these things out of it, because it takes your beloved M2010 and dials everything to 11. With modern glass, modern Atlas B&T bipod, and any additional features you crave, you end up with a rifle that will take anything you throw at it.
So to answer: for some its knowing that their training to hit paper and steel is never about fighting the rifle itself. For some, its knowing they can hit that varmint every single time without failure. And further still, for MIL/LEO, its the rifle that delivers a cold bore shot when it counts... every, single, time, without fail.
There are comparable rifles out there. But the choices are few and far between of what can be offered from a factory rifle, right out of the box. No matter your reason or rhyme, you get an AI when you absolutely must hit your target without failure every single time, with no exception.
Even today, with the Barrett MK22 in service with B4s, there are still trigger failures and frames cracking...
So ask yourself: have you ever had even a single situation where you were fighting your own rifle, whether it be any of your service rifles, or your personally owned ones? You get an AI when you finally say, "I can't afford to fight my rifle under any condition." Full stop.
I hope this quantifies things a bit better for you brother. Its an interesting question, and I'm happy to debate it.
Below is my own rifle, the AT308 with 20" factory barrel (4R 1:12) which seems to have an unusual love for Federal GMM SMK 175gr and allows me to shoot 1/2 MOA consistently. I got the rifle because I know that any training I do, ever, this rifle can handle it without fail. And I love knowing that if it ever shoots badly, that it is 100% my own fault and not the equipment, allowing me to focus very well on bettering myself. Just my personal note.
View attachment 8466614
P.S. - The history and pedigree of Accuracy International is also quite awesome, and is nothing short of inspiring. If you'd like some YouTube links to some very well made videos on it, I'd be happy to share.