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In terms of slide to frame fit..( in my opinion ):
A gun needs to be tight enough to maintain its accuracy...
and it needs to be loose enough to run reliably...
All of which is why we clean and lube our weapons after we fire them - or most of us do. A little bit of wear is normal ....and if you take care of it / even if you shoot 5,000 rds a yr thru one gun...I have little doubt that a Sig Alloy frame will last a lifetime at least..../ and probably another generation or two or three.... ( 250,000 rounds, 500,000 rds ....I don't really know ....but I think those quantities are reasonable to expect in terms of the life of a Sig alloy frame)...
as long as you're not putting super hot loads thru the gun, don't monkey with the springs trying to lighten them up too much - causing any frame abuse...( and keep it clean and lubed )....
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