Bill Ritchie, owner of EDM Arms, has been making firearms and firearm parts for over 10 years. In 1990, he built his Omni .50, a single-action .50 Cal. BMG rifle for competition shooting. It was then, too, that he joined the FCSA (Fifty Caliber Shooting Association) and started shooting the Omni .50 regularly at FCSA competitions. There were 100 Omni .50 units made. (It is noteworthy to mention that the Omni .50 is the single-shot predecessor to the Wind Runner XM-107 Tactical, Bill's latest engineering creation).

The Windrunner is a lightweight tactical takedown .50 Cal. BMG bolt-action repeating rifle. It is the most innovative, unique and novel firearm in today's market. On September 17, 1997, this incredible rifle set a world record 5" 5-shot group at 1000 yards, shot in prone position. In July 2002, it set a world record 8 3/4"  5-shot group at the FCSA competition. EDM Arms guarantees 1 M.O.A. at 1000 yards with match grade or RAUFOSS ammunition. The weight of the rifle is approximately 34 lbs, and it breaks down collapsing into a very small inconspicuous package. It comes with EDM Arms' limited LIFETIME warranty. 

EDM Arms manufactures firearms in its modern facility in Redlands Southern California, housing the latest technologies in Wire (Electrical Discharge) and CNC (Computer Numerically Controlled) Machining. Bill owned and operated Omni Tool and Die since 1979 before changing its name to EDM Arms in 1997. In 1995 he also manufactured firearm receivers in various calibers, from .17 through .308 calibers.