Ok... I own a TMAK47. Do NOT put a M120 in it (mateba, we have some laws to consider here that you dont know).
For the TM, all you need are metal bushings and a very mild spring. Maybe a spring guide. The rest can be added later IF you really need it. Or you can do the much smarter move of getting the gun and leaving it STOCK for at least a season of gaming.
After that season, you will know what to do, or if you even need it.
Right now a lot of what you want to do is buy crap or useless. Get some direct experience first.
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