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.