Browse the M4's attachment options by their Armory categories: Sights, Muzzle, Underbarrel, Laser / Light and Magazine. Camos is a separate menu category for the weapon's finish.
Keep these similarly named options separate:
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Drum Mag and Double Drum are different Magazine entries. Drum Mag has a single round drum; Double Drum has two joined drums. Default Mag carries the Default label.
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Green Laser and Green Flashlight are different Laser / Light entries. The Green Flashlight configuration projects a forward green beam.
To access the menu, take your M4 to the yellow floor circle beside the GUNS neon window inside Gun Shop. Armory opens for your current weapon. Select an attachment you own and use the displayed Equip control; unavailable items are marked Locked.
Use the Armory guide for the entrance and controller prompts. To find the case source for a particular attachment, browse the attachment directory.