you can fall in the pond, grovel out, shake the water out and keep shooting with the M2 as it's recoil operated, the 1301 is gas operated so a bit more fiddly to clean and won't cope with a full submersion without a strip down/clean. 1301's were well regarded by sporting clays shooters as a nice pointing well balanced gun if hitting the target every time was the priority and both guns fitted OK I'd go 1301 if a functioning gun mattered over all else I'd go M2
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