Ha guys the only difference in the 83 and the 87 is the triggers. The 83, and the later Aristocrat have the double set triggers. The 87 only has a standard single trigger. Barrels are totally interchangeable amongst them all. I take that back, I believe the Magnum barrels were just different enough not to fit on the unmodified frames. And I do believe the last few years they made the frames with the Mag conversion. I had my frame converted in 1992 when they came out with the .338 Win Mag barrels. So if you have a Mag Barrel made after 1992 and a frame built before 92, that has not been converted, they might not fit. Before 92 they did make 7MM Mag barrels for the TCR, those older barrels will fit all TCRs. I bought my TCR-83 with a 7MM barrel from the factory in 1985. They also made a stock without the Monte Carlo rise, it was put on guns sold with shotgun barrels from the factory. But again the other barrels were interchangeable.