Gas Block, Aluminum, Low-Profile (for 0.936" barrel)

Yep it's a standard gas block for bull-barrels of 0.936" diameter.

• Black anodized aluminum
• For use with a 0.936" barrel and standard gas tube of any length
• Securely fastens to the barrel with set screws
• Intended for normal use and environments
• Weight: 24g
• Dimensions: 26 x 30 x 38 mm (L x W x H)

You get:

• Gas block
• Gas tube roll pin

Compatible with:

• All AR-15/M16 barrels with a 0.750" gas tube section of the barrel
• Black steel and stainless barrels 

Installation Difficulty: 

Tools required: 3mm hex key and punch (not included) to get the gas tube roll pin installed

You need to watch that you don't cover the gas port and thus have the block rotated correctly. Just take your time.