T3 Forged
T3C - Cast Aluminum Receiver
T3 Ti - Titanium!
T3MX - MaxhardŽ
T6 - T3 lower and T12 flat-top upper
T6MX - T3MX and T12MX flat-top
T5 - T3 lower and T2 A2 upper
T5MX - T3MX and T2MX MaxhardŽ A2 upper