Guns from the same manufacturer probably don't even have the same lock time. Grease/no grease, oil/no oil, spray lube, bare metal on metal, hot, cold, inbetween, humid, etfingcetera, and you can tell the difference???? Give me a break! That's like telling the difference in burn rates and barrel times between different cartridges.
Anyone who profess to be able to discern differences in locktime in modern shotguns is a candidate for the neurological dissection table. Or some other special ward.
have a day
Dr.WtS