Too bad you dont want the power feeds. I have a black one with the different bottel confrigurations. And I have a silver one with a m16 type scope rail (looks like the thing on the m16's they can use to mount scopes or carry the gun). One has a m16 style grip and the other a 45 frame. And I have a old school 16" all american with a black back and green tip. The only thing is the silver one leaks for some reason but I havent fixed it because I just thought about using it for parts.
Last I heard the Panther took the same barrel thread as the thundercat and desert foxes.