Use either of these: This weapon usually doesn't malfunction . If it does, you have to stop using it right away. If it did, you would have to stop using it right away.
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AlpheccaStarsright away.In US English or straightaway in UK English https://britishisms.wordpress.com/2012/02/11/straightaway/
Anonymous. So, the use of would in both sentences are different right?One sentence uses "would," and the other sentence does not.