sig sauer airgun virtus asp .22 caliber precision airrifle with bundle (venom pellets and combo kit) virtus the mcx virtus pcp air rifle is the latest expansion to the sig air precision line of airguns, and the introduction of sig air products to the pre-charged pneumatic (pcp) category of airguns. the mcx virtus pcp doubles the muzzle energy of classic co2 models and uses the sig rapid pellet magazine making it a great tool for target training and defending against unwanted varmints.