Aero Precision’s threaded roll pin is used in multiple applications, including for the bolt catch on their M5 Lower Receivers and for the forward assist on their Upper Receivers. Made from stainless steel, it has a 6-32 thread pitch and is designed to be installed with a 1/16"" Hex Key Wrench. Note: This product is already included with Aero Precision’s M4E1/M5E1 Enhanced Uppers, M4E1 Threaded Uppers, M5 Upper Receiver and our M5 Lower Receiver. It is not necessary to be purchased separately. This individual product is available for customers who have lost or damaged their existing threaded roll pin. Works With: M4E1 Enhanced Upper Receivers M4E1 Mfg: Aero Precision
