Already have a DT15 - pick up the completer kit!
The finest upper receivers on the market, period.
DT15 16" Rifle
DT15 Duty Spec MK18 10.5 Upper - Designed for duty ammo!
DT15 300 BLACKOUT 10.5 Upper
Designed to eat any ammo you throw at it.
DT15 Crain Spec MK18 10.5 Upper - Designed for a dedicated suppressor.