There's a couple points in the slide that offer a bit of resistance, and it's normal. Main one is the little bumb that sits to the left of the hammer, that allows the linkage between the hammer and the mag's release valve to retract. Otherwise you'll fire the gun and all the gas will release from your mag after your first shot.
I wouldn't worry about it, a bit of oil and such might smooth it, but avoid trying to file down things in there. Just get used to it.
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