Assuming that the rifle has iron sights correctly aligned, take a long thin steel straightedge, and after chalking the approximate location of the blocks on barrel, hold one end of straightedge even with the center of front sight, the other on center of rear sight, and scribe the center line lightly on barrel where blocks will go.

A pair of hardened V-blocks with clamps and a sheet of heavy plate glass about 6 by 18 inches arc needed. Rest the glass on a smooth level table or bench, and the V-blocks on the glass, and rest the barrel in the V-blocks, as in Figure 181. Now find some flat surface—usually on the receiver, and turn the barrel until this sur-

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