Which was done but you reject their conclusions. You don't show where they were wrong, you just dismiss their conclusions. The HSCA photographic experts, for example, studied the photos microscopically. They concluded the rifle in the photo was the rifle recovered from the TSBD.
Conclusions aren't evidence. In this case, one panel member, Sgt Kirk, thought the single mark he saw in CE 133A "tilted the scales". That's not to the exclusion of any other rifle. No analysis or measurements of any kind were offered. I get that you like the conclusion, but that doesn't make it justified.
Frankly, it's mind-boggling that this level of proof is sufficient for
you to accept the conclusion. It's as if you don't care
how a conclusion is arrived at as long as it confirms what you already believe.
There is no way we can prove to your satisfaction that the rifle belonged to Oswald.
That's correct, because there is no proof of that. At best you can demonstrate that unscientific and biased handwriting "analysis" of two block letters on a photo of a microfilm copy of a 2-inch order coupon (from microfilm that is "missing") purports that he filled out an order coupon for a similar but not identical firearm. You have no evidence that the CE 139 rifle ever went through the postal service, was delivered to a post office in Dallas, or was ever signed for and picked up by Oswald or anybody else. You have no conclusive evidence that CE139 belonged to Oswald or even was ever in the possession of Oswald on 11/22/63, or ever.
That's why we "LOL" at the expression "Oswald's rifle".
Meanwhile, we have all of these conspiracy claims being made - the Stone movie - and you skeptics are nowhere to be found. Pardon me if we have doubts about your claims about not being conspiracists.
What "conspiracy claim" in Stone's movie would you like me to be skeptical of?