For LEO use, I'd take the Toyota of rifles over Rolls or Fiat. I want simple and dead nuts reliable. It wouldn't be pieced together in someone's garage and intended for bench use or decked out with all kinds of trick [bleep] (funky gas block/gas tube, match trigger). It also wouldn't weigh 10lbs bare.
I'd be on the hunt for:
1: Sons of Liberty Gun Works Patrol
2: Geiselle Super Duty
3: Colt 6720 or 6920
4: Rock River Tactical Entry (I was issued one for years and it was flawless).