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.
- 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
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