Weapon attachments: what fits and what it costs
The combinations currently listed in the builder, plus a reminder about spare magazines and extra ammo.
Which attachments are listed?
The finder currently covers M4 optics, grips and a suppressor, plus spare AK74 magazines. If another weapon has no results, we may not have confirmed its attachments yet.
The free starter-rifle descriptions say they cannot take attachments. Some source pages also display generic attachment lists that conflict with that description. Those combinations are disabled here until that is cleared up.
What do you want to change?
Pick an optic for the distances you expect to use it at. Try a grip when you have a handling issue you want to address. The builder shows the effects reported by its sources, but it does not calculate a combined recoil figure.
Try one attachment at a time so you can tell what changed. Filling every slot can get expensive, especially if you are still deciding which weapon to use.
Magazines and ammo are separate
Adding a spare magazine in the builder adds an empty magazine. You still need to add rounds. Extra ammo packs are counted separately from anything included with the weapon purchase.
Before buying, check the actual vendor package, your unlocks and the space in your inventory. Keep a note of anything you still need to check when saving the build.
Sources
Game details and prices come from the sources below. Loadouts, budgets and layouts are our suggestions. Community figures have not been independently checked in-game.