Leupold Mark 4HD Rifle Scope 2.5-10x42mm M5C3 FFP Illum. TMRLeupold Mark 4HD Rifle Scope 2. 5 10x42mm M5C3 FFP Illum. TMR Mark 4HD Riflescope by Leupold; Slimmer main tube with professional grade features; Three turn elevation dial for extreme distance accuracy; ZeroLock windage adjustment prevents accidental dial movement; Side focus for clear images down to 25 yards; Waterproof, fogproof, and backed by a lifetime guarantee; Professional Grade Optical System with 4: 1 zoom ratio; Ultra lightweight design;