LMT Lewis Machine 5.56 IMPERIAL REAR FLIP-UP SIGHT
REAR FLIP UP SIGHT FOR 5.56, 700 YARDS
Latest production Gen2 (current version).
Why are the marks different on this version compared to the older model (Gen1)?
Both generation sights were calibrated for 5.56 XM-855 62 Grain Penetrator SS109 ammunition. The main difference between the Gen1 and Gen2 rear sights are that the Gen2 has a more robust steel rotational drum with a different cam path than the Gen1. Both sights are calibrated for the same distances and same ammunition, however due to the change in cam paths, the distance marks are different and the Gen1 click equates to approximately 1/2 MOA while the Gen2 click equates to approximately 3/4 MOA.