The Nikko Stirling Diamond FFP 4-16×44 is a high precision scope with a 30mm main tube and is the preferred choice for professional air rifle competition shooters worldwide. USFT and World FT PCP championships were won in 2007 and 2013 with the Diamond Sportsman rifle scope. The new Nikko Stirling Diamond FFP 4-16×44 comes with a reticle in the First focal plane which allows the shooter to make shot corrections with the reticle at any magnification they wish with the corresponding 1/10 mil click value. The Nikko Stirling Diamond FFP 4-16×44 comes with side focus parallax adjustment down to 10m. The Illuminated reticle of the Diamond FFP is red and it has 11 steps to its illumination. The entire reticle of the Nikko Stirling Diamond FFP 4-16×44 illuminates.