I have an 870 TC Trap with the step rib barrel. It has cut checkering and wonderful wood. My gun was made in 1987 and it has the same wood and recoil pad design as my 11/87 Premier Trap. I was advised that in 1987, when Remington introduced the 11/87 Premier Trap and the 870 TC Trap, the first run models received wood and recoil pads intended for the discontinued 3200 Premier Trap. I have seen a 3200 Premier Trap and the wood, checkering, finish and recoil pad are identical to my 11/87 and 870 TC Trap.
The 870 TC Trap is not the same as an 870 TC which was discontinued at the time the 870 TC Trap was introduced in 1987.
The 11/87 Premier Trap and the 870 TC Trap featured step rib, over bored barrels. These barrels, as mentioned above had .18 thousands of choke before the barrel diameter was further reduced by a choke tube. These choke tubes, on both the 11/87 Premier Trap and the 870 TC Trap, were marked "Trap Full", "Trap Extra Full" and "Trap Super Full". A barrel with a "Trap Super Full" choke tube had 55 points of constriction. As memory serves, the "Trap Full" choke tube resulted in 28 points of constriction and the "Trap Extra Full" resulted in 42 points of constriction. There was also a fixed full choke version of this barrel, which I would love to have but have never seen, that had a similar choke to the older, over bored barrel of the 870 Competition Trap barrel. TS. Com member Senior Smoke, as memory serves, met someone with this unusual barrel many years ago.
I also have a Hastings 30" over bored 870 barrel with step rib and Trap Full, Extra Full and Super Full choke tubes. I have this barrel on an 870 TA and it is a money winner/