Yankee Hill Single Picatinny Rail 0.625 Inch Gas Block
Yankee Hill Single Picatinny Rail 0.625 Inch Gas Blocks are replacement gas blocks for your current system. The single rail is great for attaching front sights or other accessories. Installs quickly with the 4 included head cap screws. Retain your iron sights with this gas block. The block is constructed of high quality steel with a Mil Spec phosphate coating.