The disco valve spring feels heavier to me than the 2260. Also there's the drag on the stem from the O ring on the Disco that the 2260 doesn't have. I think I'd shoot it as it comes and check it out. As you say, a worst case situation just change 1 or 2 springs. Or if the gun is bought from someone like Tim @ Mac1, he could probably ball park it before it leaves his shop.
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