You've just got a 58X series Mini with some upgrades/tweaks. They all have a thicker barrel, new front sights, reworked extractor setup, and scope mounts moulded into the receiver. There are a number of tweaks you can do to make them a real 1 MOA shooter with good ammo.
I have a 583 series I got NIB 5 years ago that I've tweaked with a TechSight rear sight with target aperture and thinned front sight blade for 'NM' like sights, reduced gas bushing, torqued gas block, buffers, trigger job, SOCOM length Accu-Strut for better heat dissipation rather than barrel stiffening, Choate HG for heat dissipation I painted brown, shimmed receiver, and M1 Carbine sling plus the purely cosmetic addition of a walnut stock, straight OE brand 20rd mags, and a Choate front sight/FH combo to give it that full 'Mini M14' look I want.
It's very accurate and I use it to shoot bowling pins and clay pigeons at 200yds with and as you can see, it's got iron sights!