m1a barrel break in

[Bailey Guns]

Sure, use surplus. Clean the barrel, fire a few rounds, clean again.
People make a bigger deal out of it than it needs to be.

Agreed. And when you clean it you don't have to scrub the hell out of it. Just a little solvent, a couple of brush strokes and patches til it's mostly clean. Shoot it a lot more than you clean it.

I use actory that way there can be no question if there is a waraty issue

Huh...I thought surplus ammo was factory ammo. Is Lake City or Radway or Aussie stuff not made from new components in a factory?