Best I can tell by a quick set of searches, the 6721 is a flattop with a 16" 1:9 heavy barrel, correct?
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If so, then I'm sure most will agree it's a perfectly serviceable carbine, but that the 1:9 is limiting in that it may exclude some of the heavier grain loads that are top performers, and the heavy barrel is less than ideal in the carbine format. The weight penalty outweighs (ugh, no pun intended) any perceived benefit of the heavy profile for most of us.
You mention changes; I think any further discussion about how good it is would be lacking if you didn't detail what changes you made, why, and what, if any, issues they corrected. I see something about the balance in your post...did you put on a heavier stock? Replace/reprofile the barrel? Start working out?
Trident, are you referring to the AR720 that Clyde Armory has introduced? The flattop w/ pencil barrel?
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