Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

This recip fellow from McAdams' forum is arguing that if the telescopic sight on the rifle alleged to be Oswald's didn't work, he could have just used the iron sights and been better off. But, this would have been his view:

So, imagine having to target a head in the backseat of that car with no magnification. 

Here's a comparison to the conditions that CBS set up for their marksmen: