Sp , stands for special purpose , I have one that's 1990 vintage -- if you google it you will see the page adverts for it with a turkey on the page , mind you around this time if you had a 3 inch chamber gun with a flush full choke , with camo tape or spray camo , you were considered a very serious turkey chaser --with a pocket full of federal #4 or#6 copper plated lead , no gobbler stood a chance within 40 yards
The big debate in the turkey camps was if you were a #4 or#6 man ...simpler times ....I miss them
They had a dull finish walnut stocks , and a sandblasted matte blued receiver and barrel , and we're furnished with a camo sling , you could pick one up for $500 at that time , this was one of the beginings of remingtons venture away from the traditional polished blue /high sheen walnut models , and not to be confused with the economy "express " models like the matte finish and hardwood stock 870
I love remingtons , but over the years market share has slipped towards some high quality italian makes , but we see remington make a strong comeback with more modern shotguns like the v3 and versamax