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Point in case, regarding OP's question...
The real LaRue won't fit the plastic TM body because the barrel nut threading is slightly different; Madbull makes a sort of die to convert airsoft threads to accept real threads, but I doubt you'd obtain good results on a plastic body (not to mention the concept of a real steel front end on a cheap plastic receiver is just inherently wrong).
If you're going to get a real steel front end, get a good quality receiver (G&P, KA, etc). Beware cheap Chinese clones as they sometimes have minor sizing issues which will make your life a major pain.
Real steel upper will only work (modified) for the PTW.
As for the UBR, it appears to replace the entire stock tube; it just won't fit on a TM-style receiver (TM, CA, G&P, etc). Fortunately, Magpul PTS announced they were planning a PTS version of the UBR, and that should work fine.
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