I think you might find there are better choices for a starting point than a pistol already fit with an Ed Brown grip safety. During the installation process, there is so much material removed from the lower surface of the frame tangs, that you'll have a drastic mismatch, when coupled up to a GI grip safety. The hammer is no problem, but the grip safety will be a work around.
Now I know what you're doing here.
Like myself and many other 1911 owners, you're looking for justification to build a new pistola

.
And that's alright!

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