>>63814676
A classic fudd lore people still belive:

"5.56 guns aren't effective under 10 inches"

These same people push 9mm PCCs, MP5s and 300 Blackout. A 7.5" AR-15 in 5.56 is a better weapon than an MP5 with respect to killing people in defensive scenarios. This will make people seethe but look at the ballistic math both terminal and trajectory