Nice varminter.
1:12 won't stabilize the heavier bullets, they'll tumble. It's a varmint twist.
1:9 is a goord compromise and will run 55gr-69gr from my experience. 1:7 is needed when you go to the high end...like 80gr. 1:7 will throat the barrel a bit sooner.
My service rifle was a White Oak Precision 1:7 that would shoot .5 MOA with the 69gr SMK. It was my first tack-driving AR. 600 yards is common in CMP shooting.
Later, I bought a Clark Gator upper. Those are guaranteed to run .5 MOA with handloads. It didn't disappoint although it differred with a 1:9 twist. It's application is a bit different as it is primarily a 3 gun rifle and shooting to 600 is rare in that arena.
I've had some others along the way and all were good rifles if I kept everything tight on the bolt carrier. I've ran several hundred through them all at one time and never had any issues to a "dirty" AR. Since I expect max accuracy, non were chrome lined. You'll find that A LOT of AR's are using the same or comparative parts. Many manufacturers use Wilson or Shaw barrels.....mostly Wilson. Model 1 uses Shaw.
This last year I built a Model 1 kit to have a beater/bump fire AR that I could run a few thousand of Wolf through and not worry about degrading accuracy. I have several heavy barrel AR's so I went with the pencil barrel, lightweight CAR kit (something the girlfriend could shoot, too). The kit's finish was really good when mated to a Stag lower and oiled up.
The only part that needed work was the bolt release button. It needed reamed with a drill bit to slide easily over it's pin. Check the pin first before you try to install it.
Anyhow, I broke her in by cleaning after every shot/few shots for 100 or so rounds and ran a few hundred Wolf through her. No problems. A few weeks ago in a warm spell I went out for some bench work. I loaded up some 69gr Sierra Match Kings over 24.5gr of Varget and CCI 400 primers. All my guns have loved this load.
I bagged her in good and squeezed off three. It has the "15 minute trigger job" to get the pull down to about 4lbs.
That's under 3/4 MOA from a "junk" AR that isn't even free floated. I've had some good AR's in my stable and have read all the negatives about these guns. There are a couple people who cracked bolts .....a long time ago. There appear to be no recent problems. Even if I would crack one, I could replace it with a chrome plated bolt and still be under the price of a new AR.
Anyhow, I'd get that kit and break her in well (clean after every shot with CLP patch, then dry patch for 50-100....don't let her get hot). Then I'd shoot it and shoot it and shoot it. Later I'd rebarrel with a Krieger, Compass Lake, or White Oak Precision barrel.