Yes, all upgrades are permanent, including trap upgrades. If you upgrade a saw to level 5, whenever you get a base that can be equipped with it, your saw will be level 5, not level 1.
Are trap upgrades permanent?
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Yes, all upgrades are permanent, including trap upgrades. If you upgrade a saw to level 5, whenever you get a base that can be equipped with it, your saw will be level 5, not level 1.