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the goto piston used to be the shs 14 tooth metal rack, but they've encountered some oddball issues in the recent batches like offspec tooth locations.
The SHS 15 tooth is fine, just grind off the first tooth to make it a 14.
The lonex is a good choice, I've never used one yet, but I hear really good things about it.
Aside from that, I have 3 CA blue poly/fiber pistons with metal racks, all modified down to 13.5 teeth. About 45k rounds through all 3 guns and no issues.
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