Aero Precision 10.5 M4E1 Upper with Delta Brake
This video provides an in-depth look at an Aero Precision 10.5-inch M4E1 upper receiver build, featuring the Delta brake. The instructor discusses the pros and cons of short-barreled AR-15s, including maneuverability and weight advantages versus diminished ballistics and barrel life. Technical specifications like barrel steel (4150 vs. 416R) and twist rate (1:7) are explained, along with the features of the Atlas R1 rail and VG6 Delta brake.












