The SLR-101S on the Arsenal Inc website shows a single stack rifle with thumbhole stock.  However, other places, such as KY Imports, shows a Bulgarian SLR-101S that will accept high-caps and has a pistol grip.  Are these different rifles?  Are the KY Import rifles modified to accept high-caps or is that the way they come from the factory?  Are the ones from KY Imports made by Arsenal Inc?  How far is this rifle from the SAM7?

They start off life as single stackers when then come in from Bulgaria. The guys at Arsenal, Inc. open up the mag well and add the required U.S. parts to make it legal.  Quality is just as good as the SAM-7.