Because the government does not need yet another way of tracking who owns what, where they live, storage location of said firearm, etc. What happens when you FTF sell something, and Carson MP's still have it on file? It becomes a headache if there are ever questions and opens up too much scrutiny and documented evidence of ownership. It also requires a special trip to Gate 1, a waiting period, and any time you get a new rifle or pistol and want to try it out you can't until it's registered. Not being subject to the CG's rule on this, I too must politely decline any and all registration. Provost Marshall and all his goons can pound sand.