It can be used when installing hand guard to barrel a shorter length of gas system suitable for most hand guard it is tight and small to be placed a longer rail over the gas block Gas tube roll pin included M
Product Specs:
Material: steel color black
Size: Approx. 1.38x0.98 inch (35x25mm) Diameter: Approx. 0.75 inch (19mm) weight: 1.62oz (46g) package weight: 3.53 oz (100g)
 
Package Contents:
1 x Steel Gas Block , 1 x Wrench, 1 x Pin, 3 Set Screws