Tiger Rock .750 Low Profile Micro Gas Block and Sliver Mid Length Gas Tube Assembled. 750 LR/ Micro Gas Block and Sliver .750 O.D. Gas Tube combination features an ultra low profile and allows easy installation on any standard rail. The sliver mid length gas tube is not only easy to install it also provides a great weight reduction. Gas blocks that are installed properly can also provide better reliability by preventing gas blow-by. Tiger Rock's .750 O.D. Micro Gas Block and Sliver Mid Length Gas Tube combination directly relates to: the installation of a micro gas block or Sliver mid length gas tube. The installation of a micro gas tube or sliver gas tube does not require a gas block wrench. Package Contents: Tiger Rock .750 Low Profile Micro Gas Block and Sliver Mid Length Gas Tube Assembled (GTM GB01-B) Tiger Rock GTMGB: .750 Low Profile Micro Gas Block and Sliver Mid Length Gas Tube - Assembled (GTM GB01-B)