I bought four of those kits when Cope's offered the prebuy.One was sold as a kit to a fellow builder & I built the other three on NoDakSpud and an FEG receiver! They are lightweight well made guns.
Yours turned out to be done well and you will be always proud of building & owning it. Very nice work & photos.
The difference between an SA-85 and the AMMS is the PRICE you pay to own it!