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Alan, the rear sight replacement will not require a gunsmith for the GI Model. Details here : http://www.reloaderaddict.com/best-rock-island-1911-sight-upgrade-night-sight-replacement-armory-review/

you can but you are very limited in the sights you can install. I don't know of any adjustable sights that will fit the GI style cut

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You will need to change both the front and rear sights and a special tool is needed to stake the front sight.