If you have a vernier rear sight on your No4Mk1* each click is approximately one MOA. If your No4Mk1 has the sliding ladder (Mk 3 or Mk 4), adjusted in 100 yard increments, or the 300/600 yard 'flip sight' (Mk 2), swap it for the Singer vernier sight immediately. The No 5 (Jungle Carbine) sight is in 2/3 MOA increments. This offers more precise adjustment than the No 4 Singer sight.
MOA is popular because 1 MOA is approximately one inch at 100 yards, a traditional distance on imperial rifle ranges. Note the CF shoots on metric ranges but your sights are calibrated in yards. A shooter can easily re-adjust their rifle sight by measuring the distance in inches the bullet hole is from the desired impact point, and adjust the sight that many MOA in the same direction. More to come on this subject - I think it deserves more attention. In the meantime enjoy the video.
RC
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