Timradcliffe345
member
What are the differences between Colt 6721 and 6920? Thank you gentlemen!
Differences between Colt 6721 and 6920?
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TexasRifleman
Moderator Emeritus
6920 has the M4 barrel profile, in case you need to mount your grenade launcher 
6721 has the straight "heavy" barrel.
6920 rifling is 1/7, the 6721 is 1/9
6721 has the straight "heavy" barrel.
6920 rifling is 1/7, the 6721 is 1/9
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