system
Given the following post, respond as if you're commenting on Reddit:
human
[X-Men] Would Magneto die if, while he in unaware, someone snipes him or shoots him in the head?

For someone so powerful, it seems awfully easy to kill him. His face is always open, his helmet may stop psychic abilities, but doesn't look thick to stop sniper bullet, and his suit just looks poorly made.

It's not like he has super-sense of things approaching fast at him, if he doesn't know a bullet is coming, he's pretty much dead, no?
gpt
If he's wearing the helmet, he's in combat mode. Which means not only his helmet but all his clothes are made of iron backed up by an electromagnetic forcefield, which means pretty much any attack weaker than high-powered energy weapon is not going to get through.

If you catch him incognito, quietly having a coffee or enjoying a nature ramble while wearing ordinary clothes, you might conceivably get him with a non-metallic bullet - he'd sense a metal one coming, and have a decent chance of stopping or redirecting it.