I have been talking with a buddy about building a new duty AR. This will be primarily for building searches (CQT). I have been looking into a 7" barrel but am worried about the ballistics of this length. I have read a lot of info on the 7" barrels not giving enough velocity to get good fragmentations. We use Speer gold dot 55grn soft point for duty and I was told that this has different ballistics than the standard m855. Supposedly 5.56 doesnt fragment only mushrooms. Does anyone have any knowledge on this ammo?
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