Kevin
It was highly recommended at the CPA course. These mags are smaller than the 400 series and are more prone to have ignition jump within the mag itself. I should not have stated 25 hrs, however, since I did the mod I have not had problems.
It was simple to install and you add small fitting on mag and replace one of the filter with a plug. Suggest it be done when the mag is out or when the rear inside cover is open.
Bob
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