The contentiousness over whether Taiwan is a country (autonomous or otherwise) or part of China aside, hopefully we can assume that "Made in Taiwan" is in fact made in Taiwan, and "Made in China" is in fact made in mainland China. **Saves Hong Kong debate for another day
This information is also largely relevant to 1/10th scale competition off-road buggies as I do not have many 'in box' examples for other scales and classes.
Lastly, it is worth mentioning that manufacturers will outsource the lower end kits to places like China, etc. and manufacturing premium kits onshore. Tamiya is a good example of this.
Associated Electrics: Taiwan (Currently)
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With the retiring of Gene Husting in ~2000 changes already were possibly happening, but even with the 2005 merger with Thunder Tiger it possible kits were still being manufactured in Costa Mesa, CA.
I don't own but have seen B3 clones under the Thunder Tiger brand, not sure when that started.
The circa ~2000 9043 B3 Factory Team shows 'Made in the USA':
Even the 9034 B4 Team (~2003) show 'Made in the USA':
By the time the 9036 B4.1 Factory Team (~2010) comes around we see it being 'Made in China':
** There is a multi year gap in this data, hopefully others can piece the gap between 2003 -> 2010. My assumption is that at some point (2005?) the molds and production moved to China. Possibly coincided with the downsizing move to Lake Forest, CA in 2007?
All the way up through 2016 we see kits still 'Made in China', such as the 90011 B6 Team Kit:
** Late 2017 / Early 2018 appears to be when the 'Lost' or 'Stolen' injection molds debacle happened in China. By 2018 we started seeing all new B6 parts were clearly made from new molds (different ejector pin locations, etc) and were also of a superior plastic to the previous.
Starting in 2018 kits were 'Made in Taiwan' such as the 90021 B6.1D:
All current kits are still being 'Made in Taiwan'.
Team Losi Racing (TLR): Taiwan
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All TLR 22 kits, and presumably all kits from 2011+ appear to be 'Made in Taiwan':
** Again these are 'Team Losi Racing (TLR)' kits, not to be confused with 'Losi' which is the non-competitive, RTR focused brand. Presumably 'Losi' is 'Made in Taiwan' as well.
Yokomo: Japan
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Yokomo's most recent 2WD race buggy (YZ2-DTM) is 'Made in Japan':
Kyosho: Japan
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Kyosho's most recent 2WD Race Buggy (RB7) is 'Made in Japan':
Schumacher: UK?
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Schumacher does not stamp their boxes with "Made in . . ." They are a UK based company, but can anyone confirm they are indeed manufactured in the UK?
XRAY Model Racing Cars: Slovakia
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All XRAY kits are manufactured onsite in their facilities. Their business is subsidized via a larger manufacturing business (owned) with the Hudy family. It is unclear the level of governmental involvement with their interests.
Hot Bodies (HB) / HPI Racing: Taiwan?
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I do not have their latest 1/10th 4WD or any of their current 1/8th platforms, however their last 2WD Race Buggy, the D216 (2015) was 'Made in Taiwan':
Honorable Mentions:
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Tamiya: Japan / Phillipines
Traxxas: Taiwan
Tekno RC: Taiwan
Serpent:
Mugen Seiki:
Redcat:
Arrma:
Axial:
CRC:
Custom Works:
Conclusion: The large majority of RC manufacturing is performed in Taiwan.