Davidson Defense Micro Steel Gas Block
.750 Barrel Size
Manufactured from high-quality AISI steel and finished with a Mil-Spec phosphate coating. This gas block has a bore diameter of .750 inches.
What size you gas tube do you need? Measure the distance from the barrel shoulder to the gas port on your barrel and compare 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
Total Tube Length:
Pistol: 6 3/4"
Carbine: 9 3/4"
Mid-length: 11 3/4"
Rifle: 15 1/4"