Armory Sponsor
Posted: 2/8/2009 11:08:18 AM EDT
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Can I replace my standard rear aperture with a NM rear aperture on my Garand? Will it adjust correctly with a non NM pinion? I know that some minor gunsmithing will have to be preformed.
Or should I just buy a complete NM rear and front sight. Thanks |
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Quoted:
Can I replace my standard rear aperture with a NM rear aperture on my Garand? Will it adjust correctly with a non NM pinion? I know that some minor gunsmithing will have to be preformed. Or should I just buy a complete NM rear and front sight. Thanks This might help you out: http://www.fulton-armory.com/NMRearSight.htm |
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Quoted:
Can I replace my standard rear aperture with a NM rear aperture on my Garand? Will it adjust correctly with a non NM pinion? I know that some minor gunsmithing will have to be preformed. Or should I just buy a complete NM rear and front sight. Thanks Sir, the NM rear sight aperture assembly consists of a curved rack with teeth along the lower edge that engage the corresponding pinion teeth of the elevation knob. The hooded aperture engages through the aperture of the rack piece and is held in position by a small snap ring. The hooded aperture also has two tiny balls swaged into the front side of the hood that engage a horizontal slot milled into the rear side of the curved rack aperture. I memtion all this to ensure you understand my answer to your question. Replacement of the hooded aperture part of the assembly while possible will require some machining and is generally not adviseable unless you have the necessary mill. In the link provided above the assembly that Fulton sells is a complete assembly and will require some hand fitting and peening to properly fit the sight base. If you don't have the NM2A sight base I don't believe you'll ever get the NM curved rack/hooded aperture to fit properly but for short range shooting it will probably be adequate. Most shooters that never shoot these rifles at an extended distance ever realize the NM aperture doesn't fit properly because they never have to set the assembly more than a dozen or so "clicks" up from the full down position. When the rear sight is extended up sufficiently for shooting 600yd the curved rack is over twenty "clicks" above the bottom (depending on where the 200yd zero was set). The lateral movement of the hooded aperture due to recoil becomes quite noticeable at this position because the POI on paper takes a decided three o'clock alternating with a nine o'clock POI. HTH, 7zero1. |
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Having installed a few dozen of these to M14s, M1As and M1s, I can tell you a couple things to look at/for:
- the rear sight ramp should not fit into the rear sight base. This means you have to remove metal from the side (as the Fulton armory link says) in order to make it fit. You should NEVER peen the base or sight ramp to make the tight fit. I have seen over-zealous peening (or use of a center punch) make a couple chips in the sight base. Maybe the base was incorrectly hardened? - Put some lapping compound on the lugs on the backside of the windage knob and install the elevation pinion and windage knob ONLY. Twist the windage knob a few hundred times (we had a crank we put on the knob to do this). This will lap the knob to the receiver indents so that each click is consistently the same amount of travel. It may not be exactly 1/2moa....more like 3/8, but it's consistent. Put a dial indicator on the base sometime and see if you move the same amount each click. 1moa should be about .006 - .007". - Once you have lapped in your sight and fired at 200yds to obtain a no-wind zero, you can use the .007"/moa to move your front sight to bring your rear sight to mechanical zero, and trim the front sight blade down to bring your rear sight to about 3-4 clicks from bottom. This way your rear sight isn't too high at 600yards (another 12-13moa higher) and you end up looking thru a grossly angled peep. |
| Yes, you can use the NM aperture/ramp in a standard base. This will give you 1/2 moa elevation adjustment (1moa with the elevation pinion, 1/2moa by rotating the hood up or down). You gain 1/2moa windage adjustment by going to the NM base/windage knob, which have 32 threads per inch vs. 16 threads per inch on the standard base. |
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Quoted:
Thank you for the info. But I am still confused, the previous poster noted that I would need a National Match base in conjunction with modifying the NM sight ramp. If I modify the sides of the aperture, will it fit in a standard sight base? Yes you can use a standard base.. BUT the aperture will not lower al lthe way down as you need to mill out the 'rounded' portion of the base. |
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