If shorter is better... why stop at 10.3"

Mil Gear Explainer

Recommended read that you can't find anywhere else: Classic M16 Armorer's Manual : https://amzn.to/49Ur5yf Black Rifle M16 Retrospective: https://amzn.to/4v4qEKc Black Rifle 2 : M16 Retrospective: https://amzn.to/4fyp5iQ Official GOV M16/M4 Classic Manual : https://amzn.to/42MZgUM Operator's M4/M16