I didn’t shoot all that much, a little over a thousand rounds of very different ammo through my M4, but never heard a click. It shoots and cycles everything, including light bird loads. M4 was around long enough that I consider it to be the most reliable and soft shooting semi auto shotgun ever. And the sound and mechanical feedback of cycle is just pure orgasm.
It’s a little on a heavy side but there are ways to lighten it up. Toni System forend and stock will decrease the weight significantly, yet make it front heavy. Titanium or carbon tube may balance it out.