.625 Low Profile Gas Block

These gas blocks along with our gas tubes create an efficent and reliable gas system for your AR15 or AR 308 rifle build. Features: Fits barrels with .625 Outer Diameter Constructed from 4140 hardened steel Choose No Aero Logo or Aero "A" Logo blocks Nitride or Phosphate coating Low profile for easy fitment Set Screws are Steel 10-32 x 3/16 Knurled Cup Point Made in the USA *Roll pin not included* Please note: We do not recommend the use of red thread locker on the threads of the set screws. If you decide to use thread locker we recommend using the non permanent variety.