Sig already built it.
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Exceptional accuracy
Heavy, fixed barrel with chamber and bore hammer-forged simultaneously
Excellent trigger that breaks crisp and clean after taking the slack out
Optimal diopter and snapshooting sights, adjustable for windage and elevation
On-the-weapon folding bipod fitted into a recessed handguard (SG 550 SP)
Reliable functioning
Rugged, yet simple, design concept employing a proven gas system and rotating bolt
Virtually closed weapon system
Night Operability
Night sights, with integrated light source, on front and rear sights
Mounts designed to accept light intensifier or infra-red sights
Ergonomically correct stock design for fast locking into the shoulder and quick target acquisition
Ambidextrous design for left- and right-handed individuals
All controls within easy reach
Magazine "multipack" system and bolt hold open device for rapid magazine change
Fast and easy handling required during combat situations... also providing for quicker proficiency in training
Low weight factor
High-grade synthetics are used for the butt, handguard, pistol grip and magazine
Application of sophisticated weight-saving design concepts enhances mobility and reduces shooter fatigue
Optimal layout
Low sighting line mated to the correct stock angle
Well designed pistol grip which places shooting hand in close alignment with bore axis
More here: [url]http://remtek.com/arms/sig/550/550.htm[/url]