Note: This barreled upper receiver assembly has a barrel length under 16” and is therefore subject to all NFA rules and regulations. Know your local laws before purchasing.
If you’re looking to build a high quality .300 BLK AR pistol, look no further than the Aero Precision M4E1 Threaded Barreled Upper Receiver! This complete upper receiver assembly comes with a 10″ .300 Blackout barrel and a pistol length gas system, making it perfect for your next build. The forged 7075-T6 aluminum construction ensures durability, while the billet design provides a unique, stylish look. The ATLAS S-ONE free float handguard provides ample space for accessories and features M-LOK slots for easy installation. Plus, this barreled upper receiver assembly includes the forward assist and dust cover.