Never bought or looked at prices for picatinny rail sections before, but have AR's to put sections of rail on now. Wondering about prices and polymer vs aluminum. I figure Aluminum is the way to go as weight isn't that much different vs polymer, but IDK. What do you guys think about poly vs AL rails? On prices, I see Midway has 5 slot Aluminum rails for $10 on sale right now. Good price? Looking to attach light/laser combo on a 9mm build, maybe light only for a rifle build.