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“Many air guns do not achieve their potential due to...”

Written on: 19/02/2011 by Sid Pollartd (16 reviews written)

Many air guns do not achieve their potential due to lack of power. In many cases this can be cheaply/easily corrected. The other problem is that some lighter pellets can put guns over their legal limit, 12 foot pounds for a rifle, 5 for an air pistol. The main problem in many cases is not achieving the legal limit and a consequent poor performance. The way to test the footage being delivered is to fire a pellet through a Chronoscope. This reads the speed of the pellet and converts it to foot pounds. Until now these have not been cheap, anywhere from £100 upward. However, a company has now designed one specifically for air guns and they sell for £40.80p inclusive of p&p. They are currently selling on ebay and gun shops from £56 upward. This item is the Combro CB625 Mk4 chronoscope. It weighs 55grms including the batteries and fits barrels from 12mm to 32mm in diameter. The unit is compact, 150x49x23mm. It promises 1% accuracy and apparently is tested to better than 0.5% to achieve this. The unit attaches to the barrel and when fired should not be tilted up or down, as the pellet has to break two light beams and although the unit is adjustable for pellet weight there is no compensation for extra gravitational pull. The machine can be set for Imperial or Metric readings and has a computer interface potential. It has an internal diagnostic which gives a readout on the screen to show all the options selected and any problems encountered. All equipment for computer compatability can be bought from the company for not much money, and software is free. I've heard good things about this company and its after sales service. They seem to operate at the moment almost as fast as their chronographs. They can be contacted at