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I had a SX-2 sporting clays gun. No problem with really light loads down to 7/8. Mine had 2 pistons one being for light loads. I know a sporting shooter who has one of the ones with a red stock. He is fairly competative and claims he has never cleaned his. Never skips a beat.
I have a sx2 light in 12 ga and it has one self adjusting piston. I shoot skeet wth it. It cycles light loads perfectly,is a soft shooter and swings nice. I have shot a 25 with this gun.