The ShootingSight guy is a great source for apertures, wider front sights, etc. I have a .0465 aperture for the CMP 03A3 but could not get it installed because the screw slot was wrecked. No matter, that sight would not stay put during the match so I ordered an aftermarket sight assembly and I'll put the aftermarket sight on that. I bought a USMC wide front sight blade for it and filed it down to ~.075" wide. Those 03 front sights look like a little string of fuzz to older eyes.
Hopefully I'll get the return label soon to deal with the bolt issue. I found what's supposed to be an original Remington bolt still in cosmoline, so once CMP takes care of the bolt problem I'll have a spare. The 03A3 bolt and 03 National Match bolts both headspace correctly in either rifle, so the A3 must be at or close to spec.