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National Match Hooded Rear Sight Aperture for M1 Garand M14 M1A . Apertures can be used on M1A/M14 and M1 Garand rifles with NM2 / NM2A marked Sight Bases (Not for use with standard sight base). Aperture allows elevation adjustments to 1/2 minute (MOA) adjustments by turning the hood. Aperture features a peep hole diameter of 0.0595". New production made in the USA. Minor fitting/stoning may be required as apertures are made over sized for custom fitting to you base.