Question: what is the difference between scar l and scar h?
Answer: The SCAR-L, for "light", is chambered in 5.56×45mm NATO cartridge and the SCAR-H, for "heavy", is chambered in 7.62×51mm NATO. Both are available in Close Quarters Combat (CQC), Standard (STD), and Long Barrel (LB) variants. ... The FN SCAR system completed low rate initial production testing in June 2007.