Aero Precision AR-15 M4E1 PRO Upper Receiver Assembly 5.56x45mm NATO Cold Hammer Forged Barrel ATLAS R-ONE M-LOK Handguard

The Aero Precision M4E1 PRO Upper Receiver Group built around a PRO 5.56 Cold Hammer Forged Barrel that is paired with the PRO 5.56 BCG. Included ATLAS R-ONE Handguard, BREACH Charging Handle, and VG6 Delta muzzle device round this assembly out into a premium turnkey solution for your next build.

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Cold hammer forging differs from other common barrel manufacturing processes. Rather than drilling a blank and using cutters, buttons, and reamers to machine the chamber and rifling into the barrel, a cold hammer forged barrel is made by forming the barrel around a mandrel that has the rifling inclusions precision ground into it. This process is referred to as “cold” hammer forging because the process is done at room temperature and the metal is not heated.

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Note:�The muzzle device on this upper receiver is not pinned or welded. All NFA rules and regulations apply.

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Includes:

• PRO 5.56 Cold Hammer Forged Barrel
• PRO 5.56 Bolt Carrier Group
• M4E1 Threaded Upper Receiver
• ATLAS R-ONE Handguard
• VG6 Delta Flash Hider
• AR15 BREACH Ambi Charging Handle w/ Large Lever – Black