As a general rule I've found that most firearms that LEOs like and carry are pretty solid. Ithaca pump guns used to be popular IIRC, then Remington 870s. The 870 and 870 Express were good pump guns but Remington's apparently gone to complete shit and therefore only old Remingtons are worth having. I notice a lot of LEOs tend to prefer SIGSauers (which are fine pistols generally) or Glocks (which are OK, if memey as fuck because of media dumbassery). Probably varies by department, to be sure (I could have sworn I saw a cop carrying a Beretta 92FS back in the day, which is weird because Beretta is pretty fucking expensive as a rule. As a personal carry? Maybe, yeah. But as a duty gun?).