Tippmann Crossover Black Ops XVR Paintball Marker Gun .68 caliber electro-pneumatic marker, New, lightweight compact design, Integrated break beam anti-chop eyes Ability to work in both electronic and mechanical modes, Low pressure operation under 300 PSI, Internal gasline Magnetic hall effect trigger switch, Multiple adjustable firing modes, including semi-auto, auto-response, 3-shot burst, PSP, NPPL and Millennium, Tournament lock switch, Adjustable clamping feedneck with vertical feed Machine-milled upper body, Bottom regulator with the ability to convert to a front regulator Fully compatible with HPA and Nitrogen; for CO2, see owner's manual for details, Two year limited warranty, A-5/X7 threads