The Colt SP6920 was a brief ‘civilian’ version of the LE6920. From what I have been able to identify, from reading various archived internet forum posts, the SP6920 was only manufactured during 2011 roughly. I have gathered images of a couple of examples here. The introduction page is here: https://thecoltar15resource.com/sp6920-series/

You can see information on the earlier model of the SP6920 here: https://thecoltar15resource.com/sp6920mp-b/

You can see information on the late model of the SP6920 here: https://thecoltar15resource.com/sp6920-late-production/