Hard to say without knowing their process exactly, but while adding the screw requires some additional steps, it could still be a cost savings to them. Set-ups cost money and if they can drill that 90 degree passage with the gun still in position on a machine they use for other operations, then drilling, tapping and countersinking are only a few seconds more time. Lot's less time than an additional set up, which may be required to drill the angled passage, as originally done. Another possibility is that it may allow them to do the work on a less expensive machine, say a 3 axis versus a 5 axis. I find it hard to believe they have improved ignition by adding two 90 degree turns to the fire channel. I'm thinking they are saving money on either set-up time or the type of machine required to do the angled fire channel.
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