trust me on this one.....!!
forget about the Blue, Green & any other color label, forget big pin small pin & all that other nonsense untill you get a handle on black rifles..., my suggestion is get yourself a Colt SP-1, they are the older models, 20" bbl & in my opinion the most beautiful of the Black Rifles & also most reliable.., my opinion !!!
the SP-1 will cost any where from $1,000 to $1,400 for a good one, the Govt. Carbine are quite expensive, up around $2,000 or more, especially if NIB.....
i hope i have helped you some.........