AT3 Gas Block, .625 Inch – GB-1C

About the AT3 Low Profile Steel Gas Blocks:

• 4 sizes available: .625″, .75″, .825″, and .936 (.75″ is the most common size, but always measure the barrel if you aren’t sure!)
• Low profile design, perfect with all free float handguards
• Premium steel construction (better than aluminum for withstanding extreme temperatures)
• Secured using 2 set screws (screws, Allen wrench and roll pin included)
• Backed by the AT3 Lifetime Warranty

About the AT3 Gas Tubes:

Premium stainless steel gas tubes, available in 4 lengths. Backed by a lifetime warranty.

Not sure what size you need? Measure the distance from the barrel shoulder to the gas port on your barrel and compare it to the chart below. (Carbine is the most common length).

Distance to port:

• Pistol = 4 inches
• Carbine = 7 inches
• Mid = 9 inches
• Rifle = 12 inches

More Details:

AT3 Gas Block Specifications:

• Material: 4150 Steel, Black Finish
• Length: 1″
• Height: Sits 3/8″ off of the barrel (fits under all free float handguards)
• Weight: 1.5-1.8oz depending on size

AT3 Gas Tube Specifications:

• Material: Stainless Steel
• Finish: Natural

Total Tube Length:

• Pistol: 6 3/4″
• Carbine: 9 3/4″
• Mid-length: 11 3/4″
• Rifle: 15 1/4″