The Aero Precision M4E1 PRO rifle was built for the end user. A seamless integration of ambidextrous controls paired with robust componentry brings the M4E1 PRO Rifle into a class of its own within the M4E1 lineup. - The M4E1 PRO Lower Receiver features a mirrored set of controls allowing for both convenient and intuitive manipulation of the ambidextrous safety magazine release and bolt catch. - At the heart of this rifle is a Ballistic Advantage Cold Hammer Forged barrel wrapped in an Aero Precision MOD 4 Handguard bringing rigidity to the table in a slimline form factor. - INCLUDES: - M4E1 PRO Lower Receiver- Anodized Black - M4E1 Threaded Upper Receiver- Anodized Black - 15 MOD 4 Handguard - Anodized Black - 16 Cold Hammer Forged BA Gov 5.56 Barrel Chrome Lined - Mid Length Gas System Pined Low Profile Gas Block - Chrome Lined Phosphate M16 Cut Bolt Carrier Group w/ C158 Tool Steel Bolt Assembly - Individually HPT & MPI Tested - AR15 A2 Birdcage Flash Hider - BREACH® Ambidextrous Charging Handle - PRO Ambidextrous Safety - EZ Install Takedown / Pivot Pins - ALG QMS Single Stage Trigger - Aero Precision Enhanced Buffer Tube - H Buffer - Magpul MOE Grip - Magpul MOE SL Stock