It is extremely robust.
https://www.aridusindustries.com/product-category/beretta1301/
The 1301 will cycle all things well, except LL, and it comes closer to cycling those than the M4, from what I have HEARD. I would believe it. That said, if you have a shell that will not quiiiettttte cycle your M4, but does the 1301, I'd say the margin is too slim to count on it, anyways. My test for cycling/function is to hold the weapon like a big pistol without locking my arm, and run it. If it will cycle through the mag and lock back, I consider it G2G.
The 1301 is a great shotgun. It is, however, a hunting gun steered toward tactical use, and the elements of design when you take it apart show this. It will not run for as long as an M4, but it will run very very very very long, indeed!