Look at DPSM, Rock River.
No, no, no, on DPMS unless you do not care about a lack of functional reliability. DPMS M4 type carbines display serious problems of premature extraction because of gas port holes larger than needed for a carbine length weapon. Symptom include the extractor pulling through the rim, leaving a shellcase stuck in the chamber. Colts are the most reliable, followed by Bushmaster,