Hello gents. I have a standard SA M1A. I have about 2500 rds fired so far. I clean the gas system every 4-500 rds. I am starting to see some wear on the piston. The stem is starting to show some pitting. Nothing major. It has never rusted. The piston itself is still looking good. Its just starting to show some streaks . It looks like some normal stuff. My question is when should I replace it? When will performance start to degrade? I was thinking about a Smith ent. piston or an LRB titanium coated piston. If anybody has any experiance with any of those I would love to hear about it. Or any other kind . How many rounds can you expect out of a typical piston from Springfield Armory ? I don't want to replace it if I really don't need to. I shimmed the gas system so I have been pretty happy with it . Thanks...