Product Description Aero Precision M4E1-T Barreled AR-15 Upper Receiver - 5.56 - 18" - FDE - Rifle Length - S-ONE 15" Aero Precision M4E1-T Barreled AR-15 Upper Receiver - 5.56 - 18" - FDE - Rifle Length - S-ONE 15" at Primary Arms Browse all Primary Arms deals $634.99 Out of Stock Price checked 5 days ago Buy Now at Primary Arms Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Aero Precision Aero Precision