M1 Garand Armory

Installing NM rear sights

National match rear sight installation

One of the most common garand modifications, is the installation of improved sights. in this section I will cover the installation of the rear hooded NM sight.  The NM rear sight is slightly oversized to give it a tight fit in the sight base. This being said you will have to shave off a small amount of metal to give it a nice tight fit, but also allow the sight to move with the elevation pinion.

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Above left NM right standard. Below standard on post war SA.

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The first thing you want to do is place a small amount of oil or cutting fluid on your file, then file a small amout of metal off the bottom just forward of the area that engages the elevation pinion(see below) this is done so the sight will not bottom out..

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The next step is to slowly take a small amout of metal equally off either side of the sight on the area that rides in the sight base (see below).

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Now check the fit, if it does not go in at all, or binds repeat the last step.

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Remember you want the sight to fit in the base tightly, but to still move freely with the elevation knob. The sight should have no play.

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You have installed a NM rear sight, now it is time to re-zero.

5.8 mill SA NM By A. Corapinski