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15 Feb 2017 13 Oct 2012 14 Mar 2011 13 Oct 2014 Yankee Hill Machine - high quality AR-15 firearms, products, and sound YHM offers a comprehensive list of installation instructions for its most Handguards Float Railed Forearms · Free Float Tube Forearms · Customizable Forearms 9 Feb 2013 I have 2 YHM Rifle length Diamond FF handguards. Have you back off a barrel nut to align. HERE'S the installation instructions for YHM stuff.Freefloat Forearms. Instructions are for the Recommended Tools: YHM Forearm Wrench (YHM-9621), YHM Picatinny Vise Jaws (YHM-7350), Armorer's Wrench. 1. Remove the existing forearm per the firearms manufacturer's instructions. 2. 3 Jul 2012