Assertion: rifle's receiver | /r/HasProperty | aperture battle sight
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text: The No. 5 iron sight line was similar to the No. 4 Mark I and featured a rear receiver aperture battle sight calibrated for 300 yd (274 m) with an additional ladder aperture sight that could be flipped up and was calibrated for 200–800 yd (183–732 m) in 100 yd (91 m) increments.