How do I align polygons in Blender?

[The Corporation]

I was working on a rifle from a reference picture until I realized that the Shapes were distorted when you viewed it from the front view. This is what it looks like right now-


BTW-Click to enlarge the picture.

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[DarkStar]

Select everything that you want to align, then press S, then X Y or Z (depending on which axis you want to align them) and then press 0.