Viper 4-12x40 PA
Dead-Hold BDC Reticle | 1 Inch Tube

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Viper Riflescope
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Viper 4-12x40 PA Riflescope
Effortlessly shrugging off recoil, moisture and darkness! The Viper's status as a premium riflescope won't be as easy to shake. Discover a riflescope with incredible performance features like premium, fully multi-coated optics with 95 percent light transmission, heavy duty Precision Force spring systems and the glass smooth Precision Glide erector system—delivering all this and more at a price that should have pulled a few more hundreds from your wallet than it did.
- 4-12x40 riflescope is ideal for big game, long range, predator/varmint, and target applications.
- Dead-Hold BDC reticle has a customized design that helps eliminate guesswork on hold-over and windage corrections. Good for any hunting or shooting at varying ranges where estimating hold-over would be a concern.
- Side knob parallax adjust allows quick and easy parallax adjustments with range numbers visible while in the shooting position.
Optical Features | |
| XD Lens Elements | Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images. |
| XR Lens Coatings | Vortex proprietary XR fully multi-coated lens coatings increase light transmission for maximum brightness. |
Construction Features | |
| One-Inch Tube | Standard tube diameter for most American riflescopes. |
| One-Piece Tube | Maximizes strength and waterproofness. |
| Aircraft-Grade Aluminum | Premium grade of aluminum, valued for fatigue resistance. |
| Precision-Force Spring System | Uses premium components in the erector-spring system, ensuring maximum repeatability and ease of adjustment. |
| Precision-Glide Erector System | Uses premium components in the zoom lens mechanism, ensuring smooth magnification changes under the harshest conditions. |
| Waterproof | Optics are sealed with o-rings to prevent moisture, dust, and debris from getting inside the binocular. |
| Fogproof | Barrels are filled with argon gas to inhibit internal fogging. |
| Shockproof | Lenses are locked in place, fore and aft, with machined locking rings to remain in perfect alignment and withstand recoil and impact. |
| Hard Anodized Finish | Hard-coat anodization is durable; the low-glare matte helps camouflage the shooter’s position. |
| ArmorTek | Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. |
Convenience Features | |
| MAG-View Bar | Permits quick and easy adjustment of magnification range—even under the coldest conditions. |
| Fast Focus Eyepiece | Allows quick and easy reticle focusing. |
| Low Capped Turret | Is less susceptible to accidental impact damage. |
| Quick Reset Turrets | Allow quick re-indexing of the turret housing to zero after sighting in the riflescope—re-index with fingers alone (no tool needed). |
| Side Parallax | Uses an adjustment mechanism on the left side of the riflescope to fine-tune focus for the purpose of reducing parallax shooting error. |
| Magnification | 4-12 x |
| Objective Lens Diameter | 40 mm |
| Eye Relief | 3.10 inches-3.40 inches |
| Field of View | 27.1-9.2 feet/100 yards |
| Tube Size | 1 inch |
| Turret Style | Low Capped |
| Adjustment Graduation | 1/4 MOA |
| Travel per Rotation | 12 MOA |
| Max Elevation Adjustment | 57 MOA |
| Max Windage Adjustment | 57 MOA |
| Parallax Setting | 50 yards to Infinity |
| Length | 14.4 inches |
| Weight | 16.6 ounces |
| Product Manual (PDF) | Download |
| Product Manual 2 (PDF) | Download |
Viper 4-12x40 Dimensions
| Lengths | |||||
| L1 | L2 | L3 | L4 | L5 | L6 |
| 14.4 | 2.4 | 2.7 | 6.5 | 4.3 | 3.4 |
| Heights | |
| H1 | H2 |
| 1.87 | 1.57 |
Dimensions measured in inches.

Dead-Hold BDC Reticle (MOA)
Customized dot design helps eliminate guesswork on holdover and windage corrections. Good for hunting/shooting at varying ranges where estimating holdover is a concern.
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