Imported from late 1991 to 1993, the Sporting Purpose model was the same as the SAR with mostly cosmetic changes. While listed as available in 16.25" barrels, it is likely all USA imports were the longer 508 mm (20") barrel option, sold as the SP20. The SP came with sporting-style wood furniture where the pistol grip was absent. The rifle shipped with either a five or 20 round magazine. The last listed MSRP was $879.
References
Australian Automatic Arms. Sporting Rifles: SP & SP20 (Undated). | Download