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You'll be able to purchase new attachments for your weapons at the start of each mission, as well, you'll encounter them from time to time via weapon crates around the map.
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But, if you happen to have a sight that is bothering you on your weapon, it may be good to know if you can actually remove it without equipping another one first.
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However, within Back 4 Blood, there isn't a way for you to directly remove weapon attachments via the in-game menu.
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If you're looking to swap something out in favor of something new, you'll have to find a new attachment on the ground and interact with it, to replace the current one you have.
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It's a frustrating mechanic, which we can only hope is adjusted in the future.
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