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I borrowed a jig on which the floor-plate was mounted with a couple of bolts coming through the guard screw holes. The dogs-leg in the front tang was heated red-hot and beat flat with a large hammer. The bolts kept the hole spacing right. Some filing and cleaning up and the guard was good to go.
The mag box height has to be reduced so everything fits. Capacity is reduced by one round and the trigger has to be shortened.
The most common way is what mbogo3 said, cut, weld, file. I've seen them beaten into shape, all the ones I've seen didn't turn out that well. Perhaps a fault with the way the technique was used. The later Rem 30 and 720 had flat magazine boxes, but no P14/M17's were ever made with them from the factory. - dan