One thing you want to watch out for. Make sure it is a 'gen 2' (i don't know what the change is officially called). Basically the 'fixed' ones have a removeable (held in by two screws) steel insert so the aluminum lower didn't get chewed by metal AK mags.
Looks like one of the later models that came with faux swiss style front handguards and folding stock.
The earlier ones came with an ugly set of handguards with gills and didn't have a folding stock hinge, just a screw on AR buffer tube.
The early bugs should have been squashed by the time of your gun.
My bad, for some reason I thought it was the 7.62x39. Overall though, robust design, you are going to get many rounds out of it. In the past, I've called Sig on many an occasion and bought parts from them, but in truth, parts are drying up.He purchased a 5.56x45mm model. Pretty moot either way as SigArms USA doesn’t support the 556. The biggest draw back to the 556 is one has to completely depend on the secondary market to sustain the rifle should parts break or just wear out. I have some rifles like that and I rarely shoot them for that reason, it is one of the many reasons the AR15 reigns supreme as a utilitarian auto loader in the USA and will do so for the foreseeable future.
He purchased a 5.56x45mm model. Pretty moot either way as SigArms USA doesn’t support the 556. The biggest draw back to the 556 is one has to completely depend on the secondary market to sustain the rifle should parts break or just wear out. I have some rifles like that and I rarely shoot them for that reason, it is one of the many reasons the AR15 reigns supreme as a utilitarian auto loader in the USA and will do so for the foreseeable future.
Parts don't wear out that fast. I bought some spares (high wear parts) from Sig and put them away.