MI 10.5inch Upper Receiver Group MI-CRMHD9.25 M-LOK Handguard .223 Wylde 1/8 BarrelFeatures Forged 7075 T6 Aluminum Upper Hard Coat Anodizing T-Markings on Receiver 10.5 inch Chrome Lined Phosphate 4150 CrMoV Threaded 1/2x28 Chambered in .223 Wylde Criterion Core Barrel 1/8 Barrel M4 Feedramps Carbine Length Direct Impingement Gas System MI-CRMHD9.25 Combat Rail HD Series M-LOK Handguard MI A2 Flash HiderWeight 3.1 lbsMagpul and M-LOK are trademarks of Magpul Industries CorpComplete Upper Receiver groups do not come standard with charging handles and bolt carrier groups.