I have one. It was one of the very first roller-locked guns I bought it in the late 90s to early 2000s during the middle of the ban years.
If memory serves correctly the guts one mine were mostly 60s era german parts (barrel, bolt, and carrier) and were marked as such.
I dont recall what the fire control group parts were or the furniture was but it came with a slimline handguard.
Pretty much everything was pulled off of mine for other projects over the years and I have the barreled action/receiver combo stored somewhere.
Mine always went bang, was reasonably accurate, but was pretty ugly with the big aluminum receiver.
It got used as an alternate hog hunting gun with a scope for a couple years due to the integral scope mount on the receiver.
I would be hard pressed to spend $500 on one nowadays, especially not knowing what parts may be inside it and/or if you could even reuse the barrel. I think the trunnion are usually not reusable as they were glued and pinned in as there was no way to weld a steel trunnion to an aluminum receiver.