The Rosco "Built" Upper Receiver Groups (URGs) feature the best aftermarket items we sell as standard equipment in a ready to roll combo. From our highly coveted in-house made barrels, forged upper receivers, MLOK handguards, to our Bloodline accessories. You'll even have the option to complete your URG with a Rosco ACF-R Charging Handle and a Rosco Bolt Carrier Group to design one un-stoppable package. All URGs come with an A2 Flash Hider.Rosco URGs include the following: Barrel Forged Upper Receiver MLOK Handguard Gas Block Gas Tube A2 Flash Hider Our "Built" Upper Receiver Groups (URGs) are made to your order in-house by our skilled armorers. Please allow up to a week for your URG to be assembled. We will always make every effort to assemble your URG as quickly as possible. NOTE: PATROL LENGTH BARRELS COME PRE-PACKED WITH GAS TUBES, THERE WILL BE NO OPTION ON THIS PAGE FOR PATROL LENGTH TUBES, NO NEED TO SELECT GAS TUBE OR ORDER SEPERATELY.