After excellent results with 8 different sets of Masterclub metal track sets, I had to return their PT 76 set to the US seller. The links did not dry fit together well, being much too tightly fitting making insertion/alignment of the pins almost impossible. Hope this bad experience is a one off.

Maybe a little clean-up with a file would have fixed that??

There can be significant variability in the quality of MC tracks. I've had some minor issues with their resin tracks, but the worst has been two metal sets of bad tiger 1 tracks I purchased directly from MC on ebay. Both sets looked as though they were done on worn molds. Almost all links were molded with misaligned molds, so none of them fit during dry fit.

Then other sets are flawless and just fall together with almost no cleanup. Now I'm addicted to them and I'm starting to buy the tracks first then the kit to go with them.

Side note, I started adding short lengths of .5mm brass wire to the holes to add additional strength to the links.