Chris from Palmetto State Armory describes the differences between standard and free-float AR-15 setups, emphasizing that free-float designs enable the barrel to move without additional pressure from the handguard. This design improves accuracy by minimizing oscillation and harmonics. By removing components like the Delta ring and front sight post, the barrel can float freely, enhancing precision and reducing weight. For more firearm tips and information, Chris directs viewers to visit the Palmetto State Armory website.