Handguard back and forth movement

[AverageShooter]

Hey guys,
So a year or so ago I bought a troy drop in battle rail 7in. I've noticed there's always been some slight back and forth movement. Gun shoots fine. Had a cheap one on the before and no movement, just a flawed handguard? Does it matter that much? Is there a fix for it?
Thanks!

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[edslhead]

Duct tape

 

[Tony617]

Are you sure you put the retainers in correctly? I have 13" M-LOK one and put the set screws and retainers in first and then slide the hand guard on and then tightened screws.