I've got a brother in law who has shot 870's for trap for many years. His guns have trap butt stock and an after market rib and are use specific, far from field guns.
What is amazing is the round counts on his guns. I hesitate to quote a number.....plain can't remember...but when he told me I was stunned. He piks up a beater now and then for parts, but his stocked receiver and custom barrel keep going.
We picked up so much shot and wads one trip that I thought we were going to bust the suspension on his SUV.