CMMG 55DE10A Barrel Sub-Assembly 5.56x45mm NATO 16.10" Black Nitride Finish 4140 Chromoly Steel Material Carbine Length with M4 Profile for AR-15
http://www.tandktactical.com/shop/815835014067-cmmg-55de10a-barrel-sub-assembly-5-56x45mm-nato-16-10-black-nitride-finish-4140-chromoly-steel-material-carbine-length-with-m4-profile-for-ar-15-535
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CMMG's Barrel Sub-Assembly is ideal for building your custom AR-15 upper group. It comes with properly installed M4 barrel extension.
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