The Rubber City Armory Adjustable Gas Key is made from Pre-Hardened 4140 steel: 28-32RC with radiused corners reducing sharp edges. Enhances performance of low mass and standard mass GI systems without unnecessary dissassembly. Gas flow is adjusted and maintained at the carrier with set screws. One to adjust gas flow and one to lock it in place. 3 1/8 screws and 2 3/16 set screws and wrench included to make necessary adjustments.
2 mounting bolts included.