The Aero Precision M4E1 / A.T.L.A.S. Caliber Ready Enhanced Builder's Chassis System the perfect base for your next high-end AR build. Caliber Ready makes it easy for you to build a rifle in any AR-15 caliber you choose! All you have to add is the following and you're all set: The barrel, gas system & muzzle device for the caliber rifle you want to build. The caliber specific bolt carrier group. The caliber specific buffer system. from Ground Zero Precision (Product AERO-M4E1-CRBCS-15-BLK)

Reason for Flagging

Enter a comment about the problem. If the price is wrong, enter the new price below.