The gun that did stand up was Remington's Model 870.
Remington got this one right, using a forged steel receiver with heavy duty fabricated internal parts.
The 870 won about 95% of the American law enforcement market, which it still maintains today, because it does stand up.
Virtually every local, state, and Federal agency uses the 870, and it isn't because they get a cheaper price then other brands.
It's because since 1950 the 870 has proven itself reliable and tough enough to last under heavy use.
Mossberg made a try for the police market with the Model 500, but like the other aluminum and stamped internals guns it too failed and they had to do a major re-work to the Model 590 series to get any traction in the LE market.
Mossberg advertised that "Only the Mossberg was able to pass the grueling US Government 3,000 round test" to win the contract to supply guns to the military and some Federal LE agencies.
The truth was ONLY Mossberg submitted a gun to the test.
The test was a simple pass-fail test, which if the gun passed the company could submit a bid to supply guns.
Since no American maker was able to make a shotgun cheaper then Mossberg's cast aluminum gun, there was no chance anyone else was going to get the contract, so no one submitted a gun.