You can find the Bravo Company Low Profile Gas Block .750 here Fast $9.95 shipping! Orders over $200 ship for free!
The Bravo Company Gas Block for AR15, M16, M4, M4A1 has a Low Profile design and is precision machined from steel with a phosphate finish for corrosion resistance. Fits barrels with a .750" gas block index. The BCM Gas Block is manufactured within very tight Mil-Spec tolerances for a tight fit and reliable gas flow. Barrel ID honed after finish per USGI TDP. Includes steel 10-32 x 3/16 Knurled Cup Point Set Screws.
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