Heavy but sturdy - AIM Sports Inc M4 Handguard/Quad Rail Carbine Length

This is a solidly built quad rail. No issues with snapping it into place, and it's quite secure. I haven't tested it to see how well it retains zero when you take it on and off, but based on how little wiggle there is, anything like a laser or light should be able to be removed and re-mounted without losing zero. It's a bit heavy, but that's to be expected for a less expensive rail like this one.