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Quentin2 · September 13, 2012, 12:29 AM

If you plan to shoot 75 gr in the carbine then Colt's 1:7 is what you want. Really doesn't matter whether the barrel is 16 or 20".

September 13, 2012, 12:29 AM	#4
Quentin2 Senior Member Join Date: June 18, 2009 Location: NorthWest USA Posts: 1,243	If you plan to shoot 75 gr in the carbine then Colt's 1:7 is what you want. Really doesn't matter whether the barrel is 16 or 20".