The Remington 870,is undoubtably one of the finest and most reliable pump-action shotguns,ever made. I am very happy with its overall performance,both as a clay gun and as a practical competition gun-despite the snobbish behaviour of some shotgunners,in the UK.
The 870,has had good reviews,over the years, from shooting journalists,who have used the gun for clay and PSG events.
The Mossberg 500,is cheaper than the 870,but is still a decent enough shotgun,for most uses.