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Posted: 12/3/2007 1:26:18 PM EDT
I'm looking to buy either a Colt 6721 (1:9 rate of twist, heavy barrel) or a Colt 6920 (1:7 rate of twist, M4 profile barrel). What difference does the rate of twist make? Which one should I get and why?
Link Posted: 12/3/2007 1:29:16 PM EDT
the 1/7 allows you to shoot bullets up to 77gr while the 1/9 up to 69gr.

for more detailed info take a look HERE

Link Posted: 12/3/2007 2:16:15 PM EDT
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