Saint Michael’s Armament Gas Block Tool
Product Details:
The GBT-4 is the one tool that will do all 4 common AR-pattern gas block sizes.
With the lightened hollow core design, the GBT-4 weighs less than a standard Saint Michael's Armament Gas Block Tool (GBT), but offers 4x the uses. Made of 4130 CMV with a Salt Bath Nitride Treatment, this tool is made to last a lifetime.
