phone: 888-310-0284

AR15 Low-Profile Gas Block - .750"

In stock! Fast shipping!

Every gas-operated AR (those that don't use a piston system) uses a gas block of some type to cycle between shots. If you're building one of those old-school or retro style AR, yours may have a fixed front sight that doubles as the gas block or some similar fold-up variant. But if it's any number of countless newer designs, it'll probably have a gas block that serves only as the gas block. Plus, more often than not, it'll have a low-profile design, so that some type of handguard can slide over and around it to shield it. The handguard will have a length of pic rail on top on which you can then mount either a fixed or a folding sight to serve as the rifle's front sight. If you're in the latter group, this is your gas block. See below for more info.

Use our guide to install your gas block!


  • Compatible with mid-length, carbine-length, and rifle/full-length barrels
  • Compatible with any 5.56mm or .223 barrel with a .750"-diameter gas port
  • Set screws included
  • Diameter: 0.750"
  • Net Weight: 1.5 oz.
  • Color: Black
  • Material: Steel
  • Finish: Parkerized
  • CNC Precision-Machined

WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.

GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.