Look back at post #15 and read it more closely. This is a HOME DEFENSE shotgun. I retired back in 2002 from the Sheriff's Dept. This gun isn't going to see ANY "level of punishment". It is going to reside in a gun safe in the scabbard unless it is being laid on the seat of my truck to be brought to the range or pulled out to blast a home intruder. I am NOT in the military. I am a RETIRED LEO. I am NOT going to be smashing boulders with it or going through all kinds of tactical training courses. Been there done that and got the arthritis to prove it. Stop with the inappropriate generalizations and assumptions already.
The clamp on the 870 Mark 1 is the ONLY clamp I would ever consider, and they are going for outrageous prices if you ever see one on E-Bay. I am NOT going to install a flimsy POS on the end of my barrel that does nothing but rub off the finish.