After cleaning the rifle, which makes me appreciate the brilliance of the AR-15, I put it back in the safe and found the laser bore sighter. This will be next task this week, to get close enough to reliably get holes in the 25 yard target.
UPDATE: The bore sighter is not long enough to go into the muzzle because of the M1A's flash hider. I might machine a piece of acetal .30" diameter with one end large enough to accept the .30" end of the bore sighter.
UPDATE 2: I ordered a bore sighter that goes in the chamber so flash hider length should not be a problem.
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