I have three Sigs. A 226, 228 and a 239. I have shoit thousands of rounds through each of them and noticed no excessive wear.
The frame and slide will show wear. There is no way to avoid it as they are moving parts. The key is does it affect reliability and accuracy. The answer is no it does not.
Keep the gun clean and well lubricated and you will not be able to shoot it enough to wear it out.
Enjoy
Rusty
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