The SP3R rail was designed out of necessity from shooting 3 gun and sniper competitions where barricade or improvised shooting positions are frequent. At only 2” wide it fits perfectly into your hand. On a barricade, barrel, ledge or window opening the flat surfaces give you a sturdy rest allowing for accurate, faster shot placement. Modular accessory rails are field adaptable to any slot without removing or needing to reach the inside the hand guard. The SP3R comes with new integrated key mod system to attach accessories.