That's a NICE carbine for $750 - you did VERY well. However, I do have to wonder about the rear swivel - It SEEMS to be further forward than the regulation placement. I THOUGHT that SA sent out jigs to the modifying arsenals so that everything would be uniform. 

A good example of why I recommend, and follow, the "no swivels" line of thought. Nice as the gun is, the unusual swivel placement would bother me. Very sorry to rain on your parade. Now I wish I'd looked at the GB pics sooner