Excellent upper for competition or spr build - Aero Precision M4E1-T 18in .223 Wylde RM15 Complete Upper Receiver

For the money I do not think you could find a better 18" SPR upper. Built mine for tactical / 3 Gun competition and this works flawlessly, great accuracy and low recoil with a wide selection of amm0 from 45 grain .223 to 77 Grain 5.56 OTM.
Lightweight and easy to maneuver:paired with an extended charging handle and NBC BCG. Could not be more pleased with this purchase.