Yankee Hill Machine unveiled a completely new concept to the Ar-15 gas block.

Geared towards the guys who pin and weld their muzzle devices to meet the 16″ OAL for their barrels.

Once you pin an weld changing your gas block is something thats just not going to happen unless you wish to unpin and unweld.

Thanks to Yankee Hill Machine they resolved that issue by adding a hinge to their newest low-profile gas block.