12 June 2007

The C7 Rear Sight

This is the rear sight of my XM177E3. It was mounted backwards from the factory. The concave portion is supposed to face the target, not the shooter. I fixed it! Only shot the detent and spring across the room three times! And found all the parts every time too! A miracle if there ever was one!

This is the same sight set to the long range aperture:

The long range aperture is only 0.0155" taller than the normal range one. The effects are interesting though. I have a sight radius of 14.3125", changing apertures changes the point of impact 1.9335" at 50 yards, 7.7819" at 200 yards and 11.6806" at 300 yards! That means the short range aperture would shoot 11.7" below the point of aim at 300 yards, that changes it from a head shot to a torso shot!
Posted by Angus McThag at 15:57
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