I bet it doesn't cost any more to manufacture. There are no more machining steps for them. Maybe for the Chinese company that supplies the probe or Foster fitting, but I bet the price difference is fractions of a penny.I hate them and misplaced mine for the Vulcan 3 so I machined a new one from 303 stainless that can be left in the gun. I much prefer a foster fitting which should be cheaper for the manufacturer and less machine steps so I don't know why fill probes exist.
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That said, I do prefer the fixed Foster fitting too, but it doesn't stop me from enjoying the one gun I have that has a probe.
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