long or short action, stagger feeds are older versions. The magazine box (whether blind mag or detachable mag) is attached to the action on stagger feed models. The mags for center feed are attached to the stock. Most people don't consider one any better than the other. It matters mostly when purchasing a stock. And yes, the action screw spacing is different for s/a s/f vs s/a c/f. The screw spacing is the same for l/a's whether they are s/f or c/f.
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