I had one AM 395 carb that required some drilling of the low speed circuit to get it to run right. It was always lean at idle no matter the screw setting and therefor didn't accelerate worth a darn. I might have had to lower the pop off pressure too to get it to supply enough fuel at full...
There are almost no non chrome ring options in the 1mm thickness.
Replacement chrome rings can be ordered directly from Wiseco.
https://www.wiseco.com/product-category/powersports/pistons-powersports/piston-components/ring-set/
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