The KonusPro 3-9x50mm are supremely rugged and perfectly recoil-proof, they come with an engraved/laser etched reticle that will be able to withstand extreme forces and will not break, shift or snap even if the riflescope is used with heavy calibers.. As with all Konus scopes, they are nitrogen purged 100% for true waterproof & fogproof integrity, as well as being shockproof. Waterproof, Fogproof, Shockproof Dry Nitrogen Filled Adjusting Range @ 100m/": 1.3m/52.4" Heavy Caliber Recoil Proof Reticle Multi-Coated Optics Finger Adjustable Turrets Mounting Length: 151mm/5.9"