Only some models use Magpul accessories.
The LE6920 is still available and is the model Colt most carried at Walmart.
They also sell several other AR versions like the Magpul version and the M4-A1 SOCOM version.
This year the standard LE6920 comes with the Magpul BUIS rear sight, no carry handle, no side sling swivel, one Magpul P-mag 30 round magazine, and the Rogers Super Stock.
This year, all Colt's come with one P-Mag, no sling, no cleaning kit, and either the Magpul BUIS or the Army standard Matech BUIS rear sight.