If you're talking about the standard free float tube SA puts on the Saint 'pistols', you'll be fine. (As long as you're not doing mag dumps and overheating the firearm, anyway.)
Gas block = could be a problem.
I'm not sure where they went. Perhaps they were on a rifle that I sold... But I had some of the early Magpul knock-offs from ... Tapco(?). I actually preferred those plastic sights to standard sights, and even some aftermarket options. They were cheap and looked the part, but worked very well.
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Don't even try it. It's even worse than the internet would lead you to believe.
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