I'm thinking about getting a NM front sight and the smaller 0.52 NM rear aperture for my M1 since it's only used for target shooting anyway. Can I install this in my existing sight base or do I need additional parts?
If all you want is the smaller aperture and narrow front sight blade, then you only need to install those parts.
If you want NM 1/2 minute windage adjustment, you need to replace the windage knob and rear sight base as well. To get 1/2 minute elevation adjustment, you need the special NM hooded aperture that turns 180 degrees.
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