The 77s open up a lower speed, and retain velocity well enough to cover a lot of ground as far as barrel lengths.

I guess I don't see a downside. I like the 77s in any barrel length. For me though, 10.5" is as short as I'll go in 5.56.




I was watching this vid the other day, Colion Noir, with something like a 5" 5.56.....just ridiculous.....grin.