If he had an alibi or a reasonable explanation about the gun, I would be all over it. I think the science behind the bullet extraction comparisons is shaky. Only now are most people starting to accept that bite mark evidence is not reliable and it was used for years. So I am generally a skeptic with this type of evidence.
Why I think the PCA is so strong is if it wasn't RA, it means there was another guy that no one saw on the bridge at the time of the murders. What are the odds that RA was on the bridge at the time of the murders, wearing the clothes that were seen in the video, owned a gun that matched a bullet found at the seen...but he didn't actually commit the crime?
The defense to most crimes is: it wasn't me! I wasn't there! I was at Sally's house roasting a turkey watching the Price is Right and now they're trying to frame me! Most people aren't like yes I was in fact at that very bank that was robbed and I was too wearing a ski mask and carrying a gun but surely you don't think I was the robber??
RA is either BG or the unluckiest guy ever.