OK, It may look like I'm obsessed with the 6520's, but I'd like to satisfy my curiosity about these two particular models. Why did Colt change the model name from "Colt Carbine" to "Colt Govt Carbine", but kept the same model designation in place ?? ( R6520 ) In a recent post I referred to a rare 6520 variant, and I now think I may have answered my own query. From available serial # data, it appears that the Pre-Ban "Colt Carbine", model #6520 ran up to # CC001616. The Pre-Ban "Colt Govt Carbine", also model #6520 ran up to GC018500. The LATE production CC's appear to be exactly the same as the early GC's, except for the roll mkgs. ( Re: Carbine -vs- Govt Carbine ) What was Colt's reasoning behind the name change ? ( Unless it was to make the weapon's name appear more official, as in approved by the Govt, read as "clean & officially sanctioned" ?? ) Can anyone elaborate on this subject ?? THANKS. Regards, Dom Pastore Jr.