SIG TANGO MSR FFP 1-10X26MM High Performance 10x optical system with low dispersion glass Integrated thread in throw leaver for quick magnification changes Illuminated MSR BDC-10 reticle with 11x brightness levels Lay flat flip back lens covers included Dependable waterproof, shockproof and fog proof performance Includes aluminum 34mm ALPHA-MSR cantilever mount Front Focal Plane (FFP) BDC-10 provides accurate ranging and hold overs at all magnification ranges MAGNIFICATION 1-10x OBJECTIVE LENSE DIAMETER 26mm MAIN TUBE DIAMTER 34mm RETICLE FFP MSR BDC10 FOCAL PLANE First FIELD OF VIEW (HIGH/LOW) 12 to 120 Feet at 100 Yards EYE RELIEF (HIGH/LOW) 82.5 to 87.5 mm EXIT PUPIL (HIGH/LOW) 2.6 to 7.6mm ILLUMINATION Yes BATTERY TYPE CR2032 (included) WATER PROOF RATING IPX7 TOTAL TRAVEL >100MOA in both Windage and TRAVEL PER ROTATION Elevation 50 MOA ADJUSTMENT INCREMENTS 1/2 MOA per CLICK OVERALL LENGTH 11 in WEIGHT 21.9oz