Basically, rifles that fit the SCAR specifications.
The SCAR 16S and 17S:
SCAR 16s, the 5.56 NATO. Civvie version of SCAR-L.
SCAR 17S, the 7.62 NATO. Civvie version of SCAR-H.
Robinson Arms XCR:
XCR-L, 5.56 NATO, and is a SCAR-spec rifle, with conversion kits for 7.62x39, 6.5 Grendel...