I think stuff like furniture(grips, stocks, sling...etc) The difference should not be deal breaker. PTS are not allowed to use Magpul's RS material because the specific polymer composition is ITAR. So PTS uses some type of Dupont commercial formula for their product. Which since you aren't dealing with the force of recoil or heat(both needs to be considered for RS), you are probably alright....
That said, for me being in US, RS Magpul stuff is just as easy to buy(with less shipping) and cost about the same as PTS Magpul stuff. But for people outside of US and bound by ITAR from US retailer, for airsoft, PTS stuff should be alright....
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