Selling my barreled upper. All parts are new and it has not been fired. Here are the specs:
Aero Precision M4E Upper Receiver
Ballistic Advantage Barrel
Barrel Specs:
14.5" with pinned and welded Surefire Socom 3-prong flashhider
Lo profile gas block and mid length gas tube
1/8 twist
.223 Wylde chamber
Machined from 416 Stainless
Bead blasted finish
Handguard - Geissele Mk16 13.5" Black

About $900 invested. Asking $600

Possible trades / partial trades:
ACOG
KAC RAS
Handguns: Sig P365X 9mm or .380; Walther PPK/S (Fort Smith Version); Walther CCP 2nd Gen 9mm or .380
Semi Auto Shotguns
Ammo: XM193, XM855, or match quality 75 or 77gr .223/5.56