I feel like this is a more interesting conversation than it usually gets. The 16-inch is the default answer for legal simplicity and ballistics, the 14.5 with a pinned comp is a popular middle ground. The 10.3 is maximum cool, minimum practicality for most people. I'm running a 14.5 on my V7 because it was the configuration I found used and it's honestly been perfect...I barely notice the difference from 16 except at the very edge of velocity data. What are you running and what was the actual reason you chose it, not the post-hoc justification?