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Old September 12, 2012, 11:29 PM   #4
Quentin2
Senior Member
 
Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,637
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".
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