SOURDOUGH
It sounds to me like the TCR-83 and the TCR-87 Aristocate were very similar except for the different angle of the stock bolt which would not show up unless the butt pad is removed. I think I have a TCR-87 Aristocrate stock on one of my TCR-87's, but it was not original. The original stock was the Hunter Shotgun Model which did not have checkering and had more drop for shooting with shotgun barrels. It split after shooting it with a 10-ga magnum barrel (with full 2-1/4 oz loads) and with a .50-140 barrel (575-gr bullets at 1600-1800 fps). The folks at Thompson Center said they would replace it, which they did. The replacement stock has a more drop like the Hunter Shotgun Model but has a cheek-piece, is checkered, and is a little shorter, which I think is for the correct pull for the double triggers of the Aristocrate. And it will interchange with my other TCR-87's.
In summary it looks to me like there were four different stocks for the TCR's. (1) All TCR-83's had the same stock which was short to accomodate the double set triggers and which had a different bolt angle than the TCR-87's, (2) there was the TCR-87 Aristocrate stock which outwardly looked like the TCR-83 stock but shared the bolt angle of the other TCR-87 stocks, (3) there was the TCR-87 Hunter Shotgun which had more drop for a scopeless shotgun barrel or iron sights on a rifle, and finally, (4) there was the TCR-87 Hunter Rifle stock which had less drop to better accomidate a rifle or shotgun barrel with a scope.
Also, one of my old catalogs shows that one could get a TCR-87 butt-stocks and forends made of extra fancy wood for $225 and $75 respectively. And one could get the stocks checkered with optional patterns. My first TCR-87 had pretty nice wood in the buttstock. For that I paid the distributer an extra $25, which I thought was a bargain. I later bought a "heavy barrel" and "heavy barrel forend" from the Custom Shop and asked for nice/dark wood to match my butt-stock. They gave me a forend of nice figured wood. Finally, I have seen a number of TCR's with real nice wood, but also some with very plain wood.
DON