The Complete Hydra 10 Upper Receiver Assembly chambered in .308/7.62X51!  We started from the Hydra Quick Change Barrel Upper Receiver (QCB-D) and added a whole lot more.  This Complete Upper Receiver includes a 16-inch .308/7.62X51 w/ Low Profile Gas and Flash Hider. When you’re looking for something bigger with change ability look no further than the Hydra 10. Will work on any standard cut DPMS round cut AR10 receiver and takes DPMS pattern magazines. All upper come with a full MLOK set and different rail attachments are available in our store.