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The scope you mention is, I believe, a .22 rimfire optic. It is not designed (reticle drop points, parallax) for a centerfire rifle. A "Freedom" scope would be fine, just not the .22 rimfire version. The Leupold neoprene scope cover should work fine for your use. Butler Creek see thru - flip open covers work as well.
I have built several AR's using PSA components, and have no issues with them. The quality is as good as any name brand mid priced AR.
Question is, why replace your upper that came with your Sport AR??
Any non "airsoft" quality cantilever mount from a known name manufacturer will give you proper height. Vortex or Burris come to mind.
For shooting from the bench, a 6 to 9 inch bipod works well. I like Harris, though MagPul makes a popular line as well.
Larry
Bipods are popular, but if you have much interest in accuracy shooting from the bench, you won't get the best groups that you and your rifle are capable of by using an attached bipod. Groups will be okay, adequate for many, but a solid and simple heavy front pedestal rest, like a Hart with a leather Protektor front bag and leather Protektor rear bunny bag will work much better.