I'm not familiar with these or, for that matter, Mossberg.
Are these rifles any good?

Savage type action, reasonable trigger.  Big claim to fame is they take AR & in .308", DPMS/SR-25 mags & M-1A mags.  Not a Ruger Precision Rifle by any means, but not a bad walk-around hunting rifle.

Has a bbl nut, so bbls will eventually be available, but not aware of any now.

ETA:  Tony Rumore of Tromix is apparently working on a .458" SOCOM conversion - bolt head & bbl.

I had one, a Predator model. Magazines are a very loose fit, due to them really needing an actual mag well, so they wobble around pretty freely. The gun itself was pretty accurate, a LOT of fun to shoot, and I never had any trouble out of it; just couldn't get past the magazines wiggling around.

If somebody were to come up with bottom metal that approximated the magazine well of an AR, they would dell the shit out of them, because the mag wobble is an almost universal complaint.

Lots of stuff available, tromix has 300 black barrels and all the tools to due install. Plus he has a trigger guard and "bottom metal" in aluminum.
MVP PARTS
Mine has been fantastic its the 24" varmint in 204r, thing shoots great.

I have the Predator in 308. Love it. M1A mags fit tight due to the two locking points, side and front. Magpul mags are alittle loose but not an issue for me. I wonder if I could drill out a spot in the front of the Mapgul for the front mag catch. Magpul mags feed smoother since the spiral fluted bolt is riding over plastic not metal.

The 15rd M1A mags are a nice compromise of capacity and length. I think the 20rds mags are too long. I usually just use the 10 rounder's.

I have to send mine in to get it threaded as I bought it before they were offering it threaded. I have an Omega suppressor on the way.

Accuracy has been sub moa with Hornady TAP 168gr and my handloads with 165gr SST bullets. Mine didn't seem to like anything heavier than 168gr.

with 15rd M1A mag


magwell


4rds TAP 168gr at 100yrds. 2-7x scope.

 
I think he gave that idea up as there were poor sales for his 300 BLK barrels. But he still has the 300 BLK barrels available if that is your thing.