I built this many years ago and it has never bobbled.

It is pretty much a mutt:
Pacific Armament Corp. Modesto CA marked Gear Logo Imbel Receiver. PAC6xxx.
RA marked lower w/ original crappy paint.
RA marked bolt and carrier.  Same number as lower.  Same SN also as lower.
Matching crappy paint top cover.
Imbel Rhodesian R1 kit less barrel.
Steyr STG 58 bbl w/ Excellent Bore.
Stolle FH. (I still have Imbel Combo Device)
Indian Selector Lever.
OD Green Australian L1A1 Carry Handle.
Std Imbel Gas Plug.
Tapco sling.

US 922R Compliance Parts are as follows.
FSE Folding Charging Handle.
DSA Hammer, Trigger, Sear and Gas Piston.
Penguin Premium Handguards and Buttstock.
Tapco SAW Pistol Grip.

2014-11-01 20.34.33 by Lon Glaze, on Flickr

700-800 on a good day. the values just not what they were at the peak.

$900 is not at all unreasonable in today's market.

I'd part it out. Folks at the fal files would like that  kit

Pm me if you wanna sell it

I see similar sell for 900-1200 locally.