I have a pre-Enhanced STS Gov't Model. Mine also had some light scratches which I removed using 400 grit emery paper attached to a sanding block. I oiled the flat surface, then ran the emery block back and forth in one direction only. It removed the scratches and now the pistol looks brand new again.
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D. Kamm
USGI M1911/M1911A1 Pistols Website
http://www.geocities.com/M1911_M1911A1
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D. Kamm
USGI M1911/M1911A1 Pistols Website
http://www.geocities.com/M1911_M1911A1